Question

factories have released toxic gases into the air, which has resulted in the spread of air pollution across a number of cities. to best address this problem, an expert in which earth - system should be consulted? biosphere hydrosphere atmosphere geosphere

Explanation:

Air pollution involves gases released into the air. The atmosphere is the layer of gases surrounding the Earth, so an expert in the atmosphere should be consulted to address air - pollution issues.

Answer:

atmosphere