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This is Scientific Americans' 60 Second Science.

I'm Emily Schwing.

How do you fight an uphill battle when the problem is moving downhill?

That's exactly what Denali National Park's resident geologist, Danny Kapp, is trying to figure out.

In recent years, the Pretty Rock's landslide transformed from a minor maintenance concern to really our foremost challenge.

On a crisp fall day in September, just inside the park entrance, not much is happening inside the offices.

Staff here are a week out from buttoning up the park for winter.

But more than 40 miles down the park's only road at a place known as Pretty Rocks,

things are really moving downhill at up to half an inch an hour.

The Pretty Rock's landslide acts much more like a glacier than it does what most people

consider to be a landslide. Paul Oleg is the director of interpretation and education at Denali.

In that it is this very ice-rich material that responds to fluctuations and temperature and will speed up and slow down based on a lot of

different factors regarding the level of the ice, the temperature of the ice. And so we tend to

consider the Pretty Rock's landslide to be more like a rock glacier than what we would typically

consider to be a landslide.

Oleg says the landslide is a harbinger of what else may come for the entire U.S. National Park

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