Q9 of 35 Page 128

_________ is used in seeding clouds.

Seeding clouds with dry ice or potassium iodide particles sometimes can initiate rain if the cloud is water laden.

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7

________ is a greenhouse gas which causes climate change and global warming.

 8

The ________ form decomposers in the pond ecosystem.

 10

An example for fossil fuel is _________ .

 11

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