The acidification of lakes and rivers in the eastern United States and in Canada raises which interesting (but unanswered) question(s) ?
A) How much of the acidification is caused by human activity?
B) How much of the acidification is natural?
C) Why are some lakes affected by acid rain, but others are not?
D) What are the long-term effects of higher acid levels?
E) All of the above
Correct Answer:
Verified
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