Most of the water in the solar system is in the form of ice or water vapor, and neither can support life. Ice covers the South and North poles Ice in a Martian crater OTHER WORLDS At the driest times of the year, they made ritual offerings to him, hoping that he would save them from serious drought. During the period of the Roman Empire, many people believed that supplies of fresh water were controlled by Neptune, the god of the sea. ![]() Oceans contain most of the world’s water and cover 71 percent of Earth’s surfaceĬlouds consist People have always understood of tiny droplets the vital importance of fresh of liquid water water. So Earth is also the only planet where water is known to exist as ice, liquid water, and water vapor. The heat of the Sun creates water vapor, which forms a significant part of the atmosphere (the air surrounding Earth), and some of this vapor condenses into water droplets to form visible clouds. It also has vast polar ice sheets and mountain glaciers. Without water, Earth would be a sterile ball of rock.Įarth is the only planet in the solar system with oceans, rivers, and lakes. This liquid water is vital to all living organisms, from the simplest microbe to the most complex animal, so it is fundamental to the existence of the whole web of life, humanity, and civilization. Both of these are known to occur throughout the solar system, but liquid water seems to be very rare because it can exist only within a limited temperature range. Simple combination of hydrogen and oxygen, water is probably common throughout the universe, but mainly in the form of ice or water vapor. ![]() Watery world Water is the most important feature of our planet. (Shenzen) Ltd., China.Ĥ 4-5_EW_Water.indd 4 US_04-05_EW_Water.indd 4Ĭontents 6 Watery world 8 Water and history 10 What is water? 12 Fresh and saltwater 14 Light, sound, and pressure 16 Oceans and seas 18 Ocean layers and currents 20 Waves and tides 22 Water and weather 24 The water cycle 26 Water and climate 28 Drought and flood 30 Erosion and weathering 32 Streams and rivers 34 Lakes and swamps 36 Hidden water 38 Frozen water 40 Water of lifeĤ2 Living in water 44 Roots and leaves 46 Living on dry land 48 Water in your body 50 Water and health 52 Water supply 54 Farms and factories 56 Fishing and fish farming 58 Water power 60 Water conflict 62 Water in the future 64 Access and consumption 66 Timeline 69 Find out more 70 Glossary 72 Index 5Ĥ-5_EW_Water.indd 5 US_04-05_EW_Water.indd 5 A catalog record for this book is available from the Library of Congress. Published in Great Britain by Dorling Kindersley Limited. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the copyright owner. Wave decreases in speed but increases in heightĬonsultant Professor Dorrik Stow Project editor Margaret Hynes Senior editor Rob Houston Senior art editor Alison Gardner Managing editor Camilla Hallinan Managing art editor Owen Peyton Jones Art director Martin Wilson Associate publisher Andrew Macintyre Picture researcher Louise Thomas Senior production editor Vivianne Ridgeway Senior production controller Pip Tinsley Jacket designer Andy Smith DK DELHIĭesign Manager Romi Chakraborty Designer Ivy Roy Senior DTP coordinator Sunil Sharmaįirst published in the United States in 2009 by DK Publishing, 375 Hudson Street, New York, New York 10014 Copyright © 2009 Dorling Kindersley Limited 09 10 11 12 13 10 9 8 7 6 5 4 3 2 1 ED742 – 01/09Īll rights reserved under International and Pan-American Copyright Conventions. London, new yorK, MeLbourne, Munich, And deLhi ![]() Wave enters shallow water and breaks on shore Crest
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