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 .....
$(1)$ 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 .....
(N/A) $(1)$ Pollutant
$(2)$ Dichlorodiphenyltrichloroethane
$(3)$ Stratosphere
$(4)$ Ozone $(O_3)$
$(2)$ Dichlorodiphenyltrichloroethane
$(3)$ Stratosphere
$(4)$ Ozone $(O_3)$
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