Question

which statement explains how smog forms?
o volcanoes erupt and release ash into the sky.
o strong storms pick up soil and mix it with fog.
o sunlight and heat react with gases in the atmosphere.
o gases move high into the atmosphere and then fall to earth in rain.

Explanation:

Smog is formed when sunlight and heat react with pollutants (gases) in the atmosphere, creating a mixture of harmful substances. Volcano - ash, soil - fog mixtures, and gas - rain processes are not related to typical smog formation.

Answer:

Sunlight and heat react with gases in the atmosphere.