Natural Resourc...

In the upper atmosphere, _____ becomes ozone, a substance that protects the earth from UV radiation and makes life on land possible.

Water can get polluted naturally due to

In oxygen cycle, the movement of oxygen takes place within

Which of the following is the main source of free oxygen?

Which phase of water cycle gives us fresh water?

Which element from the atmosphere is a part of all the processes: respiration, combustion, and formation of oxides of nitrogen?

................... is one of the ways by which water moves on the Earth.

Water pollution causes damage to the

Water cycle leads to change in _______.

During water cycle, the water undergoes .......... phase.