1.
The chemical substance used to destroy the weeds in crops is called

2.
Besides the forest fires as natural source of pollution, the other major sources of pollution are

3.
The natural source of pollution is

4.
The harmful substance released by power plants and cars is

5.
The kind of land pollution in which salt content rises and land becomes unsuitable for farming is called

6.
The reduce, reuse and recycle principle by which wastes can be reduced is classified as

7.
The Kyoto Protocol agreement signed by participating countries and became legally binding in

8.
The fuel oils and coal are classified as

9.
During the process of photosynthesis, the element that plants give off is

10.
The 'global warming' leads to