Geological Points of Interest in the Stehekin Valley
Lake Chelan National Recreation Area
North Cascades National Park Service Complex
Glossary
Accumulation zone: The part of a glacier in which the amount of snow accumulation exceeds the amount of melting.
Fault zone: A zone of fractured rocks resulting from the movement of the sides of the zone relative to each other and parallel to the fracture.
Island arc: A chain of volcanic islands situated close to a deep sea trench, formed by the collision of two oceanic plates (e.g. Aleutian Islands).
Mantle: The hot zone of the Earth below the crust and above the core.
Metamorphic rock: A changed rock formed by the recrystallization of minerals in an existing rock by heat and pressure.
Plate tectonics: A model of earth surface motion which explains earthquakes, volcanoes, continental drift and seafloor spreading.
Terranes: A group of rocks that appear to have a common geologic history distinct from neighboring rocks.
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