What geological features are formed over vast timescales due to carbonic acid interaction with minerals like calcium carbonate?

Answer

Caves and underground aquifers.

The naturally occurring, dilute carbonic acid in water chemically weathers minerals like calcium carbonate (limestone) as it seeps through soil and rock, slowly contributing to the formation of features like caves and underground aquifers.

What geological features are formed over vast timescales due to carbonic acid interaction with minerals like calcium carbonate?

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