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[MUSIC]
This white is called the Wall of Windows.
It's actually limestone.
And it started out with a little tiny hole, like the
hole on the left, and then it's eroding
and eroding and eroding.
You've got the bridge on top.
And then the bridge on top will fall away.
And then you'll have the two hoodoos left standing.
The difference between a natural bridge and an arch?
Natural bridges are formed by streams and rivers running
through underneath, cutting away.
Whereas this one is?
Whereas as this is actually frost wedging.
OK.
Where it freezes and thaws and freezes and thaws and freezes
and thaws and then it breaks away in the different layers.
[MUSIC]