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The volcanic actvitty in the Cascades is driven by the Cascadia Subduction Zone, where two of Earth's tectonic plates meet. Of the coast of the Cascades the small Juan de Fuca Plate is colliding with and sliding under the North American Plate and into the mantle. This plate drags seawater and other volatiles with it. These seep into the superheated mantle, causing some of the semisolid rock to melt into magma. This magma then rises as it is less dense than the surrounding material. It eventually makes it to the upper crust, erupting from the resulting volcanoes.

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Q: What is the cause of volcanic activity in the Cascades?
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