What The Heck Is A Rock Glacier?

Even though there are more than 10,000 rock glaciers in the western United States, most people would look at one without knowing it. Unlike the snowy glaciers we're more familiar with, rock glaciers are under-researched and hiding in plain sight. But inside these glaciers covered with rocks is a little bit of climate hope.

Read more of science correspondent Nell Greenfieldboyce's reporting here.

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