Q10 of 35 Page 128

An example for fossil fuel is _________ .

Coal is a fossil fuel made of remains of dead plants and ferns over millions of year time duration due to decomposition, high temperature and pressure condition after its the deep burial beneath the subsurface of the earth.

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The ________ form decomposers in the pond ecosystem.

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_________ is used in seeding clouds.

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Air pollution is caused by transport exhaust fumes and emission of gases like SO2, CO2, NO2 from industies. Similarly, water pollution is caused by ________ .

 12

If wild animals are killed, what difficulty would we face?