If water pollution continues at its present rate,it will eventually

Fill in the blanks:
$(1)$ The substance that spreads pollution is called .......
$(2)$ The full form of $DDT$ is .......
$(3)$ The area from $10 \ km$ to $50 \ km$ above sea level is called .........
$(4)$ Harmful ultraviolet radiation from the sun reaching the earth is blocked by .....

What is responsible for soil pollution?

The effect of smog is observed on which of the following?

What is Eutrophication?

Which free radical is responsible for the depletion of the ozone layer?