About one-third of the toxic metal,mercury (Hg),is released into the air from natural sources,such as rocks,soil,volcanoes,and the ocean.The remaining two-thirds comes from ____.

Question

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The remaining two-thirds of mercury released into the air comes from human activities, such as the burning of fossil fuels, mining, and industrial processes. Natural sources account for about one-third, while human activities contribute the majority of mercury emissions.

About One-Third of the Toxic Metal,mercury (Hg),is Released into the Air