W h at is Water Water is usually a clear liquid that falls from the sky as rain flows along streams and rivers and pours from taps Water also exists as solid ice and as a gas called water vapor Liquid water freezes into ice when its temperature drops below 32º F 0º C As liquid water warms up it slowly evaporates It turns into water vapor As the temperature rises it evaporates faster When it reaches 212º F 100º C water boils and rapidly changes into water vapor Most of the water in the world is in the seas and oceans which cover 70 percent of the Earth Thick ice covers the North and South Poles Lumps of the ice break off and fall into the sea to form icebergs and ice floes 6
Living things Living things cannot survive without water Plants take in water through their roots while animals and humans drink it Most food and all drinks including milk fruit juice tea and canned drinks consist mainly of water People also use water to cook to wash and to clean clothes and other things The experiments in this book explore different aspects of water such as how plants take in water water as ice and surface tension This paper mill uses a huge amount of water to make paper from wood pulp Dish soap is used along with water to clean dishes and other things Plants need to be watered so that they will grow tall and healthy 7
