What Causes Caverns in Limestone

question 32

Multiple Choice

What causes caverns in limestone?

• A) Hard grains of quartz sand carried in underground streams erode the soft limestone.
• B) They form when rocks above collapse into the limestone.
• C) Limestone readily dissolves in seawater, so the caverns formed originally at sea level.
• D) Groundwater in limestone is somewhat caustic, so over many years, it dissolves limestone.
• E) Rainwater dissolves carbon dioxide to make weak carbonic acid that dissolves limestone.

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