From the brains behind brains on, this is the Moment of Um.

Answering those questions that make you go,

Um, Um, Moment of Um, um, comes to you from APM studios. I'm Queenie Hayes and I'm the most extreme golfer ever.

Um.

As a self-identified extreme golfing enthusiast, I only golf in the most extreme places, like the Grand Canyon.

Four! Or the middle of time square!

Four!

Oops! Sorry! Sorry! Or even from the top of Mount Everest.

Oh, for, for, I really should have worn gloves.

Now that I've checked those off my list, I'm looking for even

more extreme places to golf. Let's think. Where could I sink a hole in one? Hmm. Donut holes,

pot holes, key holes? Nah, not extreme enough. Oh, what about sink holes? Sinkholes are spots in the

earth's surface where the ground has collapsed and formed a hole. They can be small or hundreds of

feet wide. Sometimes they're really deep or even filled with water. Hey, how are

sinkholes made anyway? My buddy Vivian was just asking about this. My name is Hazel Barton.

I'm a professor of geology and I study caves.

When a cave is very young, you have water coming from all different kind of directions

coming together to where the easiest place is for the water to escape from the rock.

So it all kind of pours into one crack, and that's the biggest crack.

And then the water goes along that crack over and over again over the years,

and it gets dissolved.

But while that process is happening, that crack is completely full of water.

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