Scroll over the bathymetric relief map to learn about the geographic provinces of the Pacific Northwest, including the subducting plate, the subduction zone, coast mountains, central valley, and cascades.
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All these geographic features are related to the subduction zone:
- Offshore plate boundary (often accompanied by a trench when older cold oceanic plate dives beneath another oceanic plate or continent. The Juan de Fuca Plate is young and warm, so doesn't result in such a trench as it doesn't dive as steeply)
- Coast Range due to compression of the plate
- Central valley, which is caught between the Coast Range and the
- Arc Volcanoes, which grow above the point where the subducting plate reaches about 100 km depth. Melting of the rock requires a particular pressure/temperature regime.