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Mount Pelee is a stratovolcano. It is made of layers of ash and lava flows from past volcanic eruptions. The volcano itself formed as a result of a process called subduction. The the east, a portion of the North American Plate is colliding with and sliding under the Caribbean Plate. As it sinks into the mantle it takes some water with it. This water alters the chemistry of the hot rock of the mantle, causing some of it to melt and rise through the crust.

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8y ago

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