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The Cascade mountain range is made up of a band of thousands of very small, short-lived volcanoes that have built a platform of lava and volcanic debris.

The volcanoes were formed on a subduction zone where the Juan de Fuca oceanic plate plunges beneath the North American Plate. Magma was forced toward the Earth's surface to erupt, forming a chain of volcanoes - the Cascade Volcanic Arc - above the subduction zone.

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8y ago

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