What air pollution is and its rate of spreading worldwide?

Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog.

the answer is d. 4

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1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

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