Many visitors when they come to Yellowstone National Park
don't realize that they're in one of the
world's largest active volcanoes.
All the hydrothermal, the hot water features
in this park, are the result of the Yellowstone volcano.
The volcano gives us much of our elevation
we have in this area because it heats the ground,
that ground is less dense,
so we have a high volcanic plateau here
of 8,000 feet.
It has supplied many of the rocks
and the soils that are in this area.
So the vegetation is responsive
to the Yellowstone volcano.
And of course the animals are responsive
to the vegetation.
The simplest, perhaps most eloquent way to describe it
is the heart of Yellowstone.
Yellowstone would not exist
without the presence of the volcano.