Evidence exists that atmospheric CO2 has increased over the last several decades, due to human activities. How could increased CO2 levels affect the pH of Earth's waters?
a. Due to the formation of carbonic acid, increased CO2 levels will increase the pH of Earth's waters.
b. Due to the formation of carbonic acid, increased CO2 levels will decrease the pH of Earth's waters.
c. Due to the formation of carbonic acid, increased CO2 levels will cause Earth's waters to become neutral.
d. It will not affect the pH of Earth's waters, as atmospheric CO2 is not located in oceans.
Ans: b. Due to the formation of carbonic acid, increased CO2 levels will decrease the pH of Earth's waters.
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