How could the smokestacks and the drilling rig cause pollution in the water?

Chemicals released by smokestacks (chimneys) can enter the atmosphere and then fall back to earth as rain, entering seas, rivers, and lakes and causing water pollution. 

Drilling rigs injects a mixture of water and chemicals into rock formations to release oil and gas. As a result, it generates huge volumes of wastewater with dangerous chemicals that can leak to ponds, lagoons and underground aquifers

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