- Question from online.
This one is from Old Mill Middle School
in Millersville, Maryland.
Can caves disappear from being
worn down so much with water moving through it?
- That's a great question.
- That's a really great question, too.
Yeah, absolutely.
The first thing that comes to mind for me are glacier caves
as they're melting at a pretty, pretty rapid rate.
We have scientists that are studying glacier caves on
national forest lands, especially on the west coast.
And some of those caves have, just in our lifetime,
even in the last 10 years, have completely melted away
so that you can't see that they're there anymore.
(big sigh)
- But limestone caves, they might take awhile for us to
notice, but they will eventually dissolve
and they'll be gone.
So, yeah.
It's just not in our lifetime.
We might not see it.
We might not see these caves--
- [Male] We have another 400 million years with this one.
- Yeah, maybe, maybe 200.