Seracs are huge pillars or blocks of ice formed where crevasses intersect. The seracs in the background here were created by an icefall in Ingraham Glacier, on Mount Rainier, Washington.

Photograph by Eric Foss, MyShot
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glacier
glacier Encyclopedic Entry

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5-12+

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Geography, Science

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A glacier is a huge mass of ice that moves slowly over land

crevasse
crevasse Encyclopedic Entry

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Religion, Geography, Science

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Encyclopedic entry. A crevasse is a deep, wedge-shaped opening in a moving mass of ice called a glacier. Crevasses usually form in the top 50 meters (160 feet) of a glacier, where the ice is brittle.