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Index: Water over earth surface Sources of water Water cycle processes Precipitation Fun Facts

Water over earth surface In our planet about 70% of the surface is covered with water. 97% of that water is salt water. 2% of the water on earth is glacier ice at the north and south poles. Less than 1% of all the water on earth is fresh water that we can actually use. We use this small amount of water in drinking, transportation, heating and cooling industry, and many other purposes. Water is vital, without it life wouldn’t exist.

SOURCES OF WATER There are two sources of water when we think about water supply, ground water and surface water. SURFACE WATER It is water that travels or is stored on top of the ground, rivers, lakes, streams, reservoirs and oceans. Sometimes surface water sinks and turns into ground water.


It is water that you can’t actually see. Any water that is underground is groundwater. In the water cycle some of the precipitation sinks into the ground and goes to watersheds, aquifers and springs. The amount of water that sinks depends on how steep the land is and that is under the ground then this water goes to the saturated zone. The saturated zone is a layer inside the ground that already has water in it.

WATER CYCLE PROCESS The water cycle process has 4 main stages. 1. Sun heats the ocean, causing water to evaporate and rise into the air 2. The vapor from the evaporation condenses and become clouds. 3. If enough water condenses then clouds will become heavy enough to drop rain and snow. 4. These rain or snow can rather go back to the ocean through rivers, streams etc.. and continue the cycle or sink into groundwells.


Water cycle affects climate by precipitation such as rain, snow and hall. Depending on the amounts of this precipitation the climate can be hot or cold.

PRECIPITATION What is precipitation? Precipitation is any form of liquid or solid water that falls from the sky and reaches the surface of the earth.

What does precipitation do? Precipitation creates runoff that travels over the ground surface and helps to fill lakes and rivers. It also moves down through openings in the soul to aquifers underground. How is precipitation distributed? Areas that are close to oceans or big bodies of water allow more water to evaporate and turn into precipitation so areas that are far from water receive less precipitation.


Without water earth would look

like the moon.  All living things need water to live. People can live several weeks without food but only a few days without water!  Water makes up 83% of our blood, 70% of our brain and 90% of our lungs. In total our bodies are 72% water.


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