Washington State Geology

Washington State's geology is diverse, shaped by volcanic activity, glaciation, and tectonic forces. The Cascade Range, home to active volcanoes like Mount Rainier, showcases the impact of subduction, where the oceanic Juan de Fuca Plate dives under the North American Plate. Glaciers carved much of the landscape, creating features like Puget Sound and the Columbia River Gorge. The state is also rich in sedimentary rocks from ancient oceans and is experiencing ongoing seismic activity due to its tectonic setting. This dynamic geology influences the state's ecosystems, natural resources, and potential hazards like earthquakes and volcanic eruptions.