Multiple Choice
What is in water in the ground that helps it dissolve limestone?
A) nitric acid from nitrogen in the air combining with rainwater
B) carbonic acid formed from carbon dioxide in air combining with rainwater
C) nothing-pure water has nothing in it, so it can dissolve more
D) oxygen-the reactivity of oxygen oxidizes the calcium of limestone
E) sand-the grains are much harder than limestone, making it more abrasive
Correct Answer:
Verified
Correct Answer:
Verified
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