Boulder Glacier ice cave in 1932

Boulder Glacier ice cave in 1932

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This image is part of the feature Glacier Retreat

Credit: US GEOLOGICAL SURVEY/SCIENCE PHOTO LIBRARY

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Caption: Glacial retreat. Image 1 of 2. People standing outside of an ice cave on Boulder Glacier, Glacier National Park, Montana, USA, in 1932. Glaciers are large, slow-moving expanses of ice, formed from compacted layers of snow. They are sensitive to climate change and in recent years most have retreated dramatically. See image E235/379 for an image taken in 1988 which shows the extent of glacial retreat in 50 years.

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Keywords: 1900s, 1932, 20th century, american, archival, archive, before retreat, before shrinkage, black-and-white, boulder glacier, climate change, climatological, climatology, disappearing, environment, geographical, geography, geological, geology, glacial loss, glacial retreat, glacier, glacier national park, glacier retreat, glaciology, global warming, history, ice, ice cave, monochrome, montana, mountain, north america, pre-global warming, pre-shrinkage, repeat photography, retreat, retreating, rocky mountains, sequence, series, snow, tourism, tourists, united states, us, us geological survey, usa

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