Joel Sartore Joel Sartore

National Geographic Photographer and Speaker

Keyword: freeze

Photo: Freezing and thawing creates polygon shapes in a river delta on the North Slope of Alaska.

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Freezing and thawing creates polygon shapes in a river delta on the North Slope of Alaska.

Photo: A man jumps over a snowy, frozen creek at the Sartore farm near Dunbar.

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A man jumps over a snowy, frozen creek at the Sartore farm near Dunbar.

Photo: Scientists from the Toolik Research Station examine a thermokarst on Alaska's North Slope.

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Scientists from the Toolik Research Station examine a thermokarst on Alaska’s North Slope. A thermokarst is a place where the permafrost has melted away, causing severe erosion.

Photo: Scientists from the Toolik Research Station examine a thermokarst on Alaska's North Slope.

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Scientists from the Toolik Research Station examine a thermokarst on Alaska’s North Slope. A thermokarst is a place where the permafrost has melted away, causing severe erosion.

Photo: Scientists from the Toolik Research Station examine a thermokarst on Alaska's North Slope.

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Scientists from the Toolik Research Station examine a thermokarst on Alaska’s North Slope. A thermokarst is a place where the permafrost has melted away, causing severe erosion.

Photo: Scientists from the Toolik Research Station examine a thermokarst on Alaska's North Slope.

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Scientists from the Toolik Research Station examine a thermokarst on Alaska’s North Slope. A thermokarst is a place where the permafrost has melted away, causing severe erosion.

Photo: Scientists from the Toolik Research Station examine a thermokarst on Alaska's North Slope.

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Scientists from the Toolik Research Station examine a thermokarst on Alaska’s North Slope. A thermokarst is a place where the permafrost has melted away, causing severe erosion.

Photo: Julie Jensen Director of Marketing | WVC O: 866.800.7326 | D: 702.443.9249 | E: j.jensen@wvc.org

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