The burning of
causes dangerous gases to enter the atmosphere.
Heavy, dense fog caused by dangerous gases mixing in the atmosphere is called .
occurs when dangerous gases mix in the atmosphere and fall back to the surface in liquid form.

Blank 1: fossil fuels

Blank 2: smog

Blank 3: acid rain

Explanation:

The burning of fossil fuels causes dangerous gases to enter the atmosphere.

Heavy, dense fog caused by dangerous gases mixing in the atmosphere is called smog.

Acid rain occurs when dangerous gases mix in the atmosphere and fall back to the surface in liquid form.

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