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Watch out for flowing water and dripping acid!

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The Elephant

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So yes, there are lots of caves with lots of formations but many of them require spelunking which is not a good place for a date. I would chose a cave that's already been turned into a tourist site.

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Carlsbad Caverns use a light, light acid to slowly erode away rock into shapes and formations.

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Caves are formed by the dissolution of limestone. Rainwater picks up carbon dioxide from the air and as it seeps through the soil it turns into a weak acid. This slowly dissolves out the limestone along the joints, bedding planes and fractures, some of which become enlarged enough to form caves.

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Rock Cycle!

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I would also suggest Ohio Caverns.

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I would suggest Carlsbad Caverns as it's got the best path for normal walking.