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11 Cards in this Set

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accretionary wedge
A mass of sediment and oceanic lithosphere that is transferred from a subducting plate to the less dense, overriding plate with which it converges.
active continental margin
The normally gently sloping continental shelf area located on the trailing edge of a drifting continent that is active with seismic or compressional tectonic activity.
craton
The segment of the Earth's continenets that have remained tectonically stable and relatively earthquake-free for a vast period of time. It is composed of the continental shield and the surrounding continental platform.
displaced terrane
A fault-bounded body of rock that originated wlse where geographically and has then moved, perhaps long distanced, by plate motion.
hot spots
An area in the upper mantle, ranging from 100 to 200 kilometersin width, from which magma rises in a plume to form volcanoes. A hot spot may endure 10 million years or more.
hydrothermal vents
A fissure in a planet's surface from which geothermally heated water issues. Hydrothermal vents are commonly found in places that are also volcanically active, where hot magma is relatively near the planet's surface.
ophiolite suite
The group of sediments, sedimentart rocks, and mafic and ultramafic igneous rocks that makes up the oceanic lithosphere.
oceanic trenches
A deep, linear, relatively narrow depression in the sea floor, formed by the subduction of oceanic plates.
passive continental margin
The normally gently sloping continental shelf area located on the trailing edge of a drifting continent that is free of seismic or compressional tectonic activity.
rift valley
Produced by tensional tectonic forces which occur at divergent plate boundaries. Rift valleys typically appear as a downdropped graben between a pair of faults, or vertical Earth movements. valley created by the formation of a rift.
suture zone
The area where two continental plates have joined together through continental collision. Usually marked by extremely high mountain ranges.