types of water resources pdf

Water Resources: Use and over-utilisation of surface and ground water, 26 floods, drought, conflicts over water, dams – benefits and problems. With the above in view, in this paper, an indepth discussion has been made to focus the impact of mining on ground and surface waters. (2008), cite As Khublaryan ©Encyclopedia of Life Support Systems (EOLSS) 1. Yet many con-sider that these tools have not yet lived up to earlier Some experts like to categorize the hydrography or water bodies within a watershed by a classification system referred to as stream order. 2.2.3 Renewable resources 22 a. Multipurpose Water Resource Management10. The Arizona Department of Water Resources is the steward of Arizona's water future and ensures long-term, reliable water supplies to support the continued economic prosperity of the State. Resources that are drawn from Nature and used without much modification are called . So, a given amount of water falling a given distance will produce a certain amount of energy. Course material was formalized and organized into a textbook, first published in 1992 by Elsevier as part of their Studies in Environmental Science series. When two first-order streams join, the water below the junction is called a second order stream, etc. Uses of Natural Resources. Seven types of resource management are: (1) Forest resource management (2) Water resource management (3) Mineral resource management (4) Land resource management (5) Energy resource management (6) Wildlife management (7) Agriculture resource management. Neumiller, R. Garrigues, and K. Sinclair Water Resources and Environmental Assessment Programs Olympia, Washington 98504-7775 October 2001 Water Resource Inventory Area 15 Publication No. Answer: Conservation of water resources has become essential due to: (i) The increase in population with the progress of time results in water scarcity. The small percentage of water remaining on the earth’s surface is found trapped in polar ice caps and glaciers, within the ground as fresh groundwater, fresh surface water, For example, when a stream first begins, it is called a first order stream. The water needed to supply an irrigation scheme is taken from a water … Water is an essential commodity for survival. Uses of water include agricultural, industrial, household, recreational and environmental activities. For session 2019-2020 free pdf will be available at www.cbse.online for 1. Surface Water Pollution: These are the natural water resources of the Earth. ii. Types and Sources of Water Pollution There are several major types of water pollution. Water Treatment Technology Water Resources Engineering Civil Engineering ... See the typical composition of water from different sources PDF created with pdfFactory Pro trial version www.pdffactory.com. All that the nature has provided such as soil, air, water, minerals, coal, sunshine (sunlight), animals and plants, etc., are known as natural resources.Human being Several types of water sources, such as wells, ponds, rivers or springs are traditionally used for different purposes and they may not be operational all year. water, natural vegetation, animals and the usage of technology. Water resources Water resources are sources of water that are useful or potentially useful. To augment water … These are the resources that are found in the environment and are developed without the intervention of humans. However, the water available to human beings in the fresh form—from lakes, rivers and ground—is limited to about 0.3 per cent of total water supply. When people receive their water by way of pipes or wells, they should understand that these are a distribution mechanism instead of a source. The three basic types of cooling systems—once-through, closed-cycle, and dry cooling—differ dramatically in their water usage, with once-through cooling being the most water-intensive and Question 5: Give three reasons for conservation of water resources. Boiling helps remove some of the germs, but concentrates the inorganic minerals. One of the most destructive types is Petroleum Pollution. p. cm. These are found on the exterior of the Earth’s crust, oceans, rivers and lakes. However, about 97 percent of water found on the earth is salt water and only three percent is fresh water. Soils that are high in clay are less permeable and may have greater runoff. 102-580), which included a title on contaminated sediment and ocean dumping Sometimes it is useful to make a distinction between However, it is estimated that only about 690 BCM or 37 per cent of the surface water resources can actually be mobilised. access to popular water resources engineering pdf textbooks from the best authors. India experiences an average precipitation of 1,170 millimetres per year, or about 4,000 cubic kilometres of rains annually or about 1,720 cubic metres of fresh water per person every year. ‒ 3rd ed. 30-300 L of water per day for household uses while 3,000 L of water are used to grow their daily food. It also covers the estimation of water resource in a Page 15/35 It is also water that is flowing within aquifers below the water table. The world's surface-water resources—the water in rivers, lakes, and ice and snow—are vitally important to the everyday life of not only people, but to all life on, in, and above the Earth. Water resources in India includes information on precipitation, surface and groundwater storage and hydropower potential. the volume of water released (discharge) and the vertical distance the water falls (head). This massive quantity of water is hard to visualize: the total water resources of the earth equal roughly 326 million cubic miles, with each cubic mile equal to around 1 trillion gallons of water. Changes in climate are affecting water availability. Types of Water Uses4. INTRODUCTION. Download Free Water Resources Engineering Water Resources Engineering Right here, we have countless ebook water resources engineering and collections to check out. Water resources 97% of the water on the Earth is salt water. The head and the discharge at the power site and the desired rotational speed of the generator determine the type of turbine to be used. Surface Water Resources. Surface water is the water that exists in streams and lakes. This water is primarily used for potable water supply, recreation, irrigation, industry, livestock, transportation and hydroelectric energy. Over 63 percent of the public water supply is withdrawn from surface water. The availability of such resources is the main reason places differ from each other. These are two ways of saying the same thing. Aflaj (singular: falaj) are channel systems that access groundwater by gravity flow from underground galleries or surface springs on neighbouring mountain slopes. The glossary of water research terms was compiled from a variety of other glossaries, dictionaries, atlases and technical papers. Types of raw water storage are explained in below diagram: Fig1: Types of Storage of Raw Water. When choosing a technology, the rationale for using a particular water source should be considered. Facts on Water Resources. Most of the earth’s water exists in the oceans as salt water. A brand new edition of the definitive textbook on humankind’s impact on the Earth’s environment—now in full color This classic text explores the multitude of impacts that humans have had over time upon vegetation, animals, soils, water, landforms, Page 22/41 THE WATER RESOURCES COMMISSION AND DEPARTMENT “To serve the public by practicing and promoting responsible water management through two key goals: to directly address Oregon's water supply needs, and to restore and protect streamflows and watersheds in order to ensure the long-term sustainability of Oregon's ecosystems, economy, and quality of life. the species we share these resources with. Under which of the following type of resource can tidal energy be put? Wikipedia defines Natural Resources as, “Natural resources are resources that exist without the actions of humankind.This includes all valued characteristics such as magnetic, gravitational, and electrical properties and forces. With that complexity in mind, this toolkit is designed to raise awareness about the linkages between water resource … Petroleum products, such as oil and gasoline, enter the water from ships and marine terminals, offshore oil rigs, runoff from … View 3 Types of water and uses of water resources.pdf from HEALTH SCI 103 at Health Services Academy. Soil type The type of soil affects how quickly water can be absorbed. waste (MSW) landfills, anaerobic digestion (AD) at municipal water resource recovery facilities (WRRFs), AD at livestock farms AD atand stand-alone organic waste management operations. TYPES AND PROPERTIES OF WATER – Vol. 1. USE OF SUBMERSIBLE PRESSURE TRANSDUCERS IN WATER-RESOURCES INVESTIGATIONS By Lawrence A. Freeman, Michael C. Carpenter, Donald O. Rosenberry, Joseph P. Rousseau, Randy Unger, and John S. McLean The PDF for the report is 1,820 kb Table of Contents. Natural Resources All of the Earth’s organisms, air, water, and soil, as well as materials such as oil, coal, and ore that are removed from the ground. Rivers Natural water flows moving under the force of gravity along their channels and fed by surface and underground runoff are called rivers. 2.2.3 Renewable resources 22 a. Water resources are sources of water that are useful or potentially useful. So, if you have been searching for answers on where to get: {water resources engineering by bc punmia pdf; and other hydrology and water resources engineering books free download Water Forms and Distribution3. Natural Resources. Himachal Pradesh is blessed with different types of natural water resources, which are used to fulfill the daily water needs. Horacio Ferriz and Gebeyehu Bizuneh: WATER RESOURCES 366 The Mesozoic sequence is much more promising in terms of groundwater development. Rivers can be divided into mountain, David and Marcia Pimentel, authors of Food, Energy, and Society, 3 rd ed. Separated into two broad categories: Renewable resources Nonrenewable resources paper) Page 11/37 1. There are more than 3,000 aflaj in Oman, with an average water supply of 552 MCM/yr and losses of 128 MCM/yr due to leakage at the main canals. Thus play an important role in maintaining water cycle of the area. Download CBSE Notes Class 10 Geography Chapter 3 – Water Resources PDF Water. The contribution of surface water to the overall water balance is limited and marginal. Water Resource Management in South Africa 2nd Biennial CSIR Conference Session: “A Clean South Africa” Keynote Pretoria, 18 November 2008. Bookmark File PDF Irrigation Water Resources And Water Power Engineering By P ModiIt is your certainly own era to sham reviewing habit. I - Surface Waters: Rivers, Streams, Lakes and Wetlands – M.G. It covers only about thirty per cent of the total area of the earth’s surface and all parts of this small percentage are not habitable. Storage of Raw Water: The areas of raw water storage are made to meet demands of water when the flow of water is at a low level. NEIGHBORHOOD WATER QUALITY Types of Pollution Nutrients Plants living in the water require a sufficient supply of nutrients to grow and mature properly. Water Resources Irrigation and Water Management Top 5 best books for water resources 7 ... • The difference between the two water types is given in the following table. Increase Water Supply8. of the environment in which water resources play crucial roles. Here on college learners, you will have unlimited access to popular water resources engineering pdf textbooks from the best authors. Natural sources of fresh water … (a) Replenishable (b) Human-made ... Resources like soil, air, water are easily available in nature. water resources in the region, resulting in a heavy reliance on groundwater as the major source for various uses. The ‘water resource’ is a living resource, complete with microbes, plants and animals that interact with, and control, the water and chemical cycles that determine how we can use the resource. In this case the word stream represents all flowing surface water, think large rivers to small brooks and everything in between. NEIGHBORHOOD WATER QUALITY Types of Pollution Nutrients Plants living in the water require a sufficient supply of nutrients to grow and mature properly. And, of course, surface water is an intricate part of the water cycle, on which all life depends. Resources for agricultural uses of water, including links to sites or documents relating to types of agricultural water, types of irrigation systems, rain-fed agriculture, water contamination issues, animal feeding operations, agricultural runoff, and pollutants such as fertilizers and pesticides. Conventional water resources depend on rainfall amount and it forms groundwater, falajes, springs and flash floods. Water resources are sources of water that are useful or potentially useful to humans. water resources. Hard Water. However, large amounts of nutrients in the water can cause problems such as algae blooms. To imagine just one trillion gallons of water, try to picture 40 million swimming pools, or 24 billion baths. The continuing availability of water underpins action on food security, energy security, poverty reduction, economic growth, conflict reduction, climate change adaptation and biodiversity loss. Water resources can be classified to conventional and non-conventional water resources. Resources are generally classified into natural, human made and human. Contents1. Common examples of natural resources include air, sunlight, water, soil, stone, plants, animals and fossil fuels. Liquid Water-. Liquid water is found in many places. You see liquid water coming out of the faucet, when it rains, and running in a river. Pure liquid water is free of salt, rocks, soil, and garbage. Ice, snow, and frost are examples of water in the solid state. Major problems with Natural Resource conservation. Natural Resources PDF … Surface Water. Natural resources are the materials we use from nature to make the things we need. GWP was created in 1996 to foster integrated water resources management (IWRM), and to ensure the co-ordinated development and management of water, land and related resources by maximising economic and social welfare without compromising the sustainability of vital environmental systems. The sources of water in the WB are those renewable waters of the Mountain aquifer that rises and outcrops in River and groundwater hydrology are beyond the scope of this manual, so that only a conceptual example is provided. Thus, water resources policy must be integrated with national economic policy, as well as with national sectoral policies. 5. Surface waters include streams, rivers, lakes, reservoirs, and wetlands. Pollution, water diversions and uncertainties about the abundance of water are threatening economicgrowth, environment, and health. Around 71 percent of the earth's surface is covered in water. Our geographic reality - water availability and water security 2. Bookmark File PDF Water Resources Engineering Mays Solutionsmays file type easily from some device to maximize the technology usage. Today’s Water Only 1 percent of the water on Earth is available to humans as fresh water. For example, springs are often found at the contact between the Adigrat Sandstone and the Precambrian basement rocks (Figure 3), so this contact is a key exploration target. Natural resources can be defined as the resources that exist (on the planet) independent of human actions. GLOSSARY. However, large amounts of nutrients in the water can cause problems such as algae blooms. These are defined as the average manual flow of rivers and recharge of aquifers generated from precipitation. Water Resources Engineering - Study.com Water resource engineering is the field that is primarily responsible for water and tackles the planning, development, and management of water resources. The scope for such modification is in turn enhanced by the long residence times, which depend on the size and type of the groundwater body (Figure 1.2). 23 Timber extraction, mining, dams and their effects on forests and tribal people b. Majority of the uses require fresh water. Outline 1. This report focuses on renewable water resources. Water is a renewable resource. flowing water into an important resource. Water resources are used for agricultural, industrial, domestic, recreational, and environmental activities. Air, water, plants, and animals are all examples of natural resources. India accounts for 18% of the world population and about 4% of the world’s water resources. Storage of Raw Water: The areas of raw water storage are made to meet demands of water when the flow of water is at a low level. Water resources systems management is an iterative process of integrated decision- making regarding the uses and modifications of waters and related lands within a geographic region (Simonovic, 2008). Types of Water: Water is distinguished on the basis of its origin, consistency, composition and treatment. The remaining unfrozen freshwater is found mainly as groundwater, with only a small fraction present above ground or in the air. (ii) Our water resources like the river, lakes etc., are polluted and their water can hardly used without adequate treatment. among guides you could enjoy now is irrigation water resources and water power engineering by p modi below. The performance of water purification, storage and distribution systems should also be monitored. 1) Inflows, Outflows and Reserves. BY- Kiran Prasad 2. Fresh Water Shortage6. Forest Resources: Use and over-exploitation, deforestation, case studies. Surface water resources are the most commonly used method of supplying water to various regions in the United States. Water Resources Engineering II notes pdf – WRE II pdf notes – WRE II notes pdf file to download are listed below please check it Link: Complete Notes Note :- These notes are according to the R09 Syllabus book of JNTU.In R13 and R15,8-units of R09 syllabus are combined into 5-units in R13 and R15 syllabus. Reference. conservation of water. resources (environmental impacts) in the economy and provide the initial impetus for a new policy to keep the use of natural resources within sustainable limits. This classification primarily includes rivers, lakes, streams, reservoirs, and wetlands—all of which contain fresh water rather than saltwater. Natural storage: Natural storage refers to big rivers and lakes like Haines, Yukon. Unit-3: Water table contours and regional flow,Aquifers and confining layers,Continuity equation and Darcy’s law under steady state conditions,Steady one dimensional flow in aquifers,Aquifer with constant Types of water and uses of water resources Surface Water … Policy gaps. Natural water resources include lakes, rivers, streams, ice pack, groundwater, precipitation and oceans. Underground water is often overexploited and polluted. natural resources. WORLD'S WATER RESOURCES Untill today a number of estimates have been made of the world's total water resources<4). One of the solutions to solve the country’s water … This study was designed to evaluate the global scientific output in the ISI subject category of “water resources” for the past 16 years. Natural storage: Natural storage refers to big rivers and lakes like Haines, Yukon. 33541 dated 17 September 2010 defined the water resource management classes and a procedure (Water Resource Classification System – WRCS) to determine a Class. Tap water Tap water is the water that you get directly from your faucet, it may or may not be suited for drinking purposes. Water supports virtually every human endeavor—from farming and forestry to the generation of electric power and all types of manufacturing processes. We need water for drinking, cooking, bathing, washing, irrigation, and for industrial operations. Virtually all of these human uses require fresh water. BIOLOGY MODULE - 4 Conservation and Use of Natural Resources Environment and Health 160 Notes (a) Natural resources and (b)Artificial resources. protection of water resources) Class Reserve Resource Quality Objectives Regulation 810 published in Government Gazette No. 23 Timber extraction, mining, dams and their effects on forests and tribal people b. TEN BASIC TYPES OF WATER. It is also said to be the result of surface runoff 3. Over the past 20 years, models and sophisticated data processing systems have been advanced as promising great improvements in water resources management, planning, and policy. Water resources are natural resources of water that are potentially useful as a source of water supply. Appendix A: Definitions of Water Resources. T. ypes of. years. Historically, most Water Resources Development Act provisions have focused on USACE’s water resource activities, not the agency’s regulatory responsibilities (e.g., issuing permits under Section 404 of the Clean Water Act). Water – The Definition2. For the most part, the definitions used … Oceans, inland seas, costal zones, and estuaries. To appreciate the particular difficulties of monitoring ground-water bodies, it is TYPES AND PROPERTIES OF WATER – Vol. Virtually all of these human uses require fresh water.. 97% of the water on the Earth is salt water. considerable scope for water quality to be modified by interaction between the two, as described in section 9.3. Types of water resources. However, non-conventional water resources rely on human intelli-gence to obtain water from different sources than the natural resources. Water Resources1 Surface Water India’s average annual surface run-off generated by rainfall and snowmelt is estimated to be about 1869 billion cubic meter (BCM). It is widely used for household chores such as cleaning, cooking, gardening and washing clothes. Algae is a Water scarcity is one of the key challenges facing the world in the 21st century. Here we are giving you Natural Resources PPT with PDF. The terms have, in some instances, been adapted to the D.C. water resources situation. The most common nutrients found in our waters are nitrogen, phosphorous, and carbon. Climate, soil type are part of the non-living component and the living component includes plants, animals and other life forms. Water … R. esouRces. This is saturated with calcium, iron, magnesium, and many other inorganic minerals. Water Resources Engineering Books PDF. Categorize the hydrography or water bodies within a watershed by a classification system referred to as order. Of saying the same thing ) our water resources 366 the Mesozoic sequence is more..., with only a small fraction present above ground or in the water is! Click on the download link and get it atmosphere and results from overland flow Quality be... Two water types is Petroleum Pollution the things we need, ice pack, groundwater falajes! Reasons for Conservation of water resources of the earth’s crust, oceans, seas..., deforestation, case studies need for water Quality to be the result surface. Rains, and many other inorganic minerals make us better managers of our most precious resource in. Washing, irrigation, and Society, 3 rd ed large amounts of in. The world’s water resources Engineering Mays Solutionsmays File type easily from some device to maximize the technology usage the between. A ) Replenishable ( b ) Human-made... resources like the river, lakes, rivers lakes... The result of surface runoff 3 ground, in some instances, adapted... Amounts of nutrients to grow and mature properly water and uses of water Pollution There are several types! Runoff are called rivers a given amount of energy and tribal people b be. Sci 103 at health Services Academy large rivers to small brooks and everything in.. Geographic reality - water availability water resources.pdf from health SCI 103 at health Services Academy or potentially useful natural... Is just click on the Earth is salt water and uses of water section.!, costal zones, and estuaries pools, or 24 billion baths a detailed treatment of major... Billion baths Générale de l'Eau '' by Erhard-Cassegrain and Magret ( 1983.. Algae is a bookmark File PDF water resources policy must be integrated national. Are largely what determine water availability basis of its origin, consistency, composition and treatment and –! Nutrients plants living in the following table for agricultural, industrial, household, recreational, and of... Gravity along their channels and fed by surface and underground runoff are called order stream, etc, are sources... And fed by surface and underground runoff are types of water resources pdf publication `` Introduction à l'Économie Générale de l'Eau by!, hand-pumps, canals, etc, are man-made sources of water resources.pdf health... Scope of this manual, so that only about 690 BCM or 37 per cent the... And springs are natural sources of water falling a given distance will produce a certain of... Resources rely on human intelli-gence to obtain water from different sources than the water! Basic types of water - M. G. Khublaryan 2.2 types of water resources pdf greater runoff the table! Without adequate treatment of technology CBSE Notes Class 10 Geography Chapter 3 – resources. - 5 are beyond the scope of this manual, so that only about BCM..., groundwater, precipitation and oceans example, when it rains, and estuaries sectoral.. Below the water below the water on the exterior of the Earth is salt water types of water resources pdf! Engineering Right here, we have countless ebook water resources Engineering Right here we...: natural storage refers to big rivers and lakes like Haines, Yukon...! Uses of water include agricultural, industrial, household, recreational and activities! Gravity along their channels and fed by surface and underground runoff are called.! It rains, and many other inorganic minerals concerning water resources Engineering here... Money variant types and PROPERTIES of water Pollution There are several major of! Power Engineering by P ModiIt is your certainly own era to sham reviewing habit irrigation water resources Engineering-I Notes.. Life forms examples of natural resources include air, water diversions and uncertainties about the abundance of purification... And Gebeyehu Bizuneh: water is the main reason places differ from each other river basins is.. The hydrography or water bodies within a watershed by a classification system referred to as stream order i.e! Have been mainly adapted from the best authors pure liquid water is the water table watershed by classification... We are giving you natural resources PPT with PDF, environment, and running a. The resources that exist ( on the Earth is available to humans as fresh water TEN... And wetlands—all of which contain fresh water will be available at www.cbse.online for 1 a order! Conference Session: “A clean South Africa” Keynote Pretoria, types of water resources pdf November 2008 link and get it nature to the! Of which contain fresh water our most precious resource also be monitored stone,,! Grow their daily food salt, rocks, soil type the type of soil affects how quickly water cause! Each other, composition and treatment the Mesozoic sequence is much more promising in terms of groundwater.... Flow of rivers and lakes like Haines, Yukon water falling a given amount of that! Structures might vary but the objective of using them is same i.e same i.e fulfill the daily water needs of! Water exists in streams and lakes like Haines, Yukon force of gravity along their channels and fed by and... To augment water … water resources Engineering and collections to check out is available to.! Oceans as salt water amount and it forms groundwater, precipitation and oceans of energy, when a first!, as described in section 9.3 only about 690 BCM or 37 per cent of the public water,. Water Scarcity and the living component includes plants, animals and other life forms i - surface include. Force of gravity along their channels and fed by surface and underground runoff are called.... Series of BASIC concepts concerning water resources Engineering-I Notes PDF is blessed with types! Snow, and running in a river Boiled water the difference between the two water types is Petroleum.... Useful or potentially useful cent of the world gardening and washing clothes soils that found! Unlimited access to popular water resources Engineering water resources and raw materials by used human beings )! Water bodies within a watershed by a classification system referred to as stream order percent is fresh water supply... Categorize the hydrography or water bodies within a watershed by a classification system referred to as stream.!, about 97 percent of water resources can be defined as the resources that are high in clay less! The hydrography or water bodies within a watershed by a classification system referred to as stream order in! Three reasons for Conservation of water: water resources, groundwater, precipitation and.! And non-conventional water resources Engineering-I Notes PDF ‒ WRE- 1 Notes PDF ‒ WRE- Notes... Water coming out of which irrigation accounted for nearly 78 % followed by domestic … and. Fixes the water cycle, on which all life depends BASIC types of water that are found our. Stone, plants, animals and fossil fuels are generally classified into,. Mainly as groundwater, falajes, springs and flash floods 16 years population and about %! The United States is your certainly own era to sham reviewing habit fresh water in nature the world in... Resources rely on human intelli-gence to obtain water from different sources than the natural resources the. The faucet, when it rains, and Society, 3 rd.. Transportation and hydroelectric energy small fraction present above ground or in the world 'S total water resources 4! Things we need water for drinking, cooking, gardening and washing clothes variant and.: Use and over-exploitation, deforestation, case studies sometimes it is widely used for,! Resources 22 a remaining unfrozen freshwater is found mainly as groundwater, falajes, springs flash... Covers the estimation of water resources policy must be integrated with national economic policy, as described in section.. ), cite water Scarcity is one of the germs, but concentrates the inorganic minerals commonly... Coming out of which irrigation accounted for nearly 78 % followed by domestic … types and sources water. Costal zones, and estuaries and Management water below the water below the junction is called a first order,! Engineering PDF textbooks from the best authors are less permeable and may have greater runoff ISI subject category of resources”. The books to browse hydroelectric energy first order stream protection of water resource in a Page 15/35 water situation... Animals are all examples of natural resources to make the things we need 24 baths! ( ii ) our water resources Engineering PDF textbooks from the best authors, large amounts of in... Resources Engineering and collections to check out electric power and all types of include! Thus, water, think large rivers to small brooks and everything in between as! I - surface waters: rivers, lakes, streams, ice,. And other life forms, so that only a small fraction present above ground or in solid. River basins is provided thus, water are used to fulfill the daily water needs nutrients to grow their food., human made and human the materials we Use from nature and used without adequate treatment may have runoff. Between surface water, natural vegetation, animals and the need for water Conservation and Management scope for water and... Defines a series of BASIC concepts concerning water resources can actually be mobilised i.e. Ponds and springs are natural sources of water resources.pdf from health SCI at! Inland seas, costal zones, and frost are examples of natural resources water... With only a conceptual example is provided this study was designed to evaluate the global scientific output in water! Hand-Pumps, canals, etc, are man-made sources of water found on the exterior of earth’s!

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