1.
Fossil fuels are rich in carbon and

2.
Thousands of mirrors or curved metals are used to focus solar energy to make it very hot, in

3.
Wind is beneficial resource of energy as it doesn't cause

4.
Hot water or steam carrying geothermal energy often comes up to surface in

5.
Fossils fuel is an important source of energy for

6.
When animals and plants are rotten in the absence of air, there produces a gas called

7.
Black painted panels which are hanged at roofs to trap heat and energy from sun, are

8.
Earth emits heat by eruptions of

9.
Plants utilize water, carbon dioxide and light to produce their own food by

10.
Plants material and waste from living things are regarded as

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