Acid rain occurs when
a. carbon dioxide combines with water in the
atmosphere.
b. phosphorus-rich water in lakes evaporates to
form phosphoric acid.
c. sulfur released in burning fossil fuels combines
with water in the atmosphere.
d. excess hydrogen is released into the atmosphere
where ozone is formed.
e. bacteria in the soil break down nitrates to
nitrogen gas, which then combines with moisture
in the atmosphere to form nitric acid.
Answer: c
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