The water on earth, understanding energy
1-put (/) for true and(x) for false:
More than half of the earth's surface is covered with land.-1
2-sea water is best for drinking. ( )
3-most of the pollution in rivers and lakes is caused by man.
4- Seas, oceans and rivers are sources of clean water. ( )
5- Glaciers are formed near the rivers. ( )
6-you can do work even if you do not have energy. ( )
7- Energy is available in various forms. ( )
8-fuels have stored energy in them. ( )
9- Sun is an important source of energy. ( )
10- Light energy is the most important form of energy. ( )
11- We need energy to do work. ( )
12- We get energy from food. ( )
13-if a car stops, it has kinetic energy. ( )
14- Work is done when you cannot move the wall. ( )
15- Thunder is a form of sound energy. ( )
1-several rivers begin from them.------------------
2- water with dirt and germs in it.------------------------------
3- removes dirt from the water.-------------------
4- used to clean the water.-------------------------------------
5-it is required to do work ………………………………………………
6-this form of energy is used by plants to make food ……………………………………………
7-this form of energy is required to make electricity in dams ---------------------------------------------------
8-our body stores energy in the form of it -------------------------------------------------
9-thing are burnt to produce energy ----------------------------
3-Hoe does river water get polluted ?
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4-Describe how water is cleaned before supplying to our house? ---------------------------------------------------------
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5- what do you understand by fuels?Name some common fuels?-----------------------------------------------------------------------------------------------------------------------------------------------------
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