Picture below

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WORK WORK

Explanation:

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1. Evaporation :- The changing of a liquid to a gas.

2. Automobile :- The major source of pollution.

3. Greenhouse effect :- Carbon dioxide and water vapour trapping heat gives off by Earth.

4. Ozonosphere :- Layer absorbing ultraviolet rays.

5. Condensation :- The changing of gas to a liquid.

6. Ionosphere :- Layer responsible for reflecting radio waves.

7. Troposphere :- The layer in which weather changes.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.