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Acid rain is formed when certain molecules, such as sulfur dioxide (SO2), react in the atmosphere to form acids. How does most SO2 enter the atmosphere?

A.
It is a byproduct of chemical weathering.
B.
It is released from hydrothermal vents.
C.
It is a byproduct of coal combustion.
D.
It is released when wastes decompose.

User Amzad
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1 Answer

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C. It is a byproduct of coal combustion. 
User Sagar Pudi
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