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15 Cards in this Set

  • Front
  • Back
plate tectonics
the theory that the lithosphere is made up of plates that float on the asthenosphere and that the plates a possibly moved by convection currents
oceanic crust
The material that makes up the ocean floor
continental crust
The material that makes up landmasses.
lithosphere
The thin outer-shell of the earth consisting of the crust and the rigid upper mantle.
asthenosphere
The zone of the mantle beneath the lithosphere the consists of slowly flowing solid rock.
divergent boundary
A boundary formed by 2 lithospheric plates that are moving apart.
rift valley
A steep, narrow valley formed as lithospheric plates separate.
convergent boundary
A border formed by the collision of 2 lithospheric plates.
subduction zone
A region where one lithosphere plate moves under another
ocean trench
A deep valley in the ocean floor that forms along a subduction zone.
island arc
A chain of volcanic islands form along an ocean trench
transform boundary
A boundary formed where 2 lithospheric plate slide past each other
convection current
The movement in a fluid caused by uneven heating
theory of mircoplate terranes
The theory that continents are a patchwork of pieces of land that have individual geological histories.
terranes
A piece of land with a geologic history distinct from that of the surrounding land.