WEBVTT

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- Question from online.

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This one is from Old Mill Middle School

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in Millersville, Maryland.

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Can caves disappear from being

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worn down so much with
water moving through it?

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- That's a great question.

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- That's a really great question, too.

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Yeah, absolutely.

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The first thing that comes to
mind for me are glacier caves

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as they're melting at a
pretty, pretty rapid rate.

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We have scientists that are
studying glacier caves on

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national forest lands,
especially on the west coast.

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And some of those caves
have, just in our lifetime,

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even in the last 10 years,
have completely melted away

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so that you can't see that
they're there anymore.

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(big sigh)

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- But limestone caves, they
might take awhile for us to

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notice, but they will eventually dissolve

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and they'll be gone.

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So, yeah.

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It's just not in our lifetime.

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We might not see it.

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We might not see these caves--

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- [Male] We have another 400
million years with this one.

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- Yeah, maybe, maybe 200.