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Mount Cleveland is part of a group of volcanoes called the Aleutian Arc, which extends along the Aleutian Islands and the Alaska Peninsula. These volcanoes formed because just to the south the Pacific Plate is colliding with and sliding under the North American Plate and into the mantle. This process is called subduction. As the plate subducts it carries water with it. This water gets into the hot mantle rock and alters its chemistry, allowing some of it to melt. The resulting magma then rises through the crust to erupt from volcanoes.

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8y ago

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