- Thank you.
So this is from Miss Dornin's class
in Galesburg, Illinois.
- Woo, Illinois!
(cheering)
(laughing)
- How big does it have to be
to be considered a cave?
- Ooh, that is such a good question.
In terms of federal lands,
where the Forest Service,
and the National Park Service manage caves,
caves are defined by the
Federal Cave Resources Protection Act.
And there's no quantitative measurement,
no number that we apply to a cave
in terms of how big it needs to be.
It just needs to be a naturally occurring
void space, or empty space like this
under the surface of the earth.
However,
in different states,
they do have a number that they apply to that.
So for Missouri or Tennessee,
where Barb is from,
they might say a cave needs to be 30 feet long,
or something like that,
in order to actually be defined as a cave.
That's a great question.
- So I can't consider the pothole in the street--
(laughing)
different,
it's okay.
- Would that be considered a sinkhole?
(laughing)
- Yeah, a Karst feature.
- A Karst feat--
Well thank you. Alright.