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Key Terms

Why is water important?

All living things need water in order to carryout their body processes. In addition, many living things use water for shelter.


The process by which plants use water, along with carbon dioxide and energy from the sun, to make their own food


The place where an organism lives and obtains all the things it needs to survive

distribution of water

97% of Earth's water is salt water found in oceans and only 3% is fresh water


Water that fills the cracks and spaces in underground soil and rock layers

water cycle

The continuous process by which water moves from Earth's surface to atmosphere and back


Plants draw in water from the soil through their roots and eventually the water is given off through the leaves as water vapor in a process called transpiration


Water that falls to Earth as rain, snow, hail or sleet

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