Lesson: Chapter 15 — The biosphere

The effects of pollution 4 of 5 Reset answers

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Question 4

What does photochemical smog need in order to form?

A Rain and cold B Only carbon dioxide C Salt water D Exhaust gases and sunlight

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Exhaust gases and sunlight. Nitrogen oxides and unburnt hydrocarbons react in sunlight above about 15 °C.

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