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- Thank you.

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So this is from Miss Dornin's class

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in Galesburg, Illinois.

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- Woo, Illinois!

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(cheering)

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(laughing)

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- How big does it have to be

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to be considered a cave?

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- Ooh, that is such a good question.

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In terms of federal lands,

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where the Forest Service,

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and the National Park
Service manage caves,

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caves are defined by the

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Federal Cave Resources Protection Act.

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And there's no quantitative measurement,

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no number that we apply to a cave

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in terms of how big it needs to be.

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It just needs to be a naturally occurring

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void space, or empty space like this

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under the surface of the earth.

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However,

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in different states,

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they do have a number
that they apply to that.

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So for Missouri or Tennessee,

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where Barb is from,

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they might say a cave
needs to be 30 feet long,

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or something like that,

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in order to actually be defined as a cave.

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That's a great question.

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- So I can't consider the
pothole in the street--

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(laughing)

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different,

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it's okay.

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- Would that be considered a sinkhole?

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(laughing)

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- Yeah, a Karst feature.

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- A Karst feat--

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Well thank you. Alright.