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22 Cards in this Set

  • Front
  • Back
asthenosphere
zone of the universe beneath the lithosphere that consists of slowly flowing solid rock
continental crust
matieral that makes up landmasses
continental drift
hypothesis stating that the contients once formed a single landmass,broke up, and drifted to their present locations
convection
transfer of heat through the movement of a fluid matieral
convection current
movement in afluid caused by uneven heating
convergent boundary
borderformed by the direct collision of two lithospheric plates
divergent boundary
boundary formed by two lithospheric plates that are moving apart
island arc
chain of volcanic islands formed along an ocean trench
lithosphere
thin outer shell of the earth consisting of the crust and the rigid upper mantle
Mid-Atlantic Ridge
undersea mountain range with a steep,narrow valley along its center
mid ocean ridges
system of undersea mountain ranges that wind around the earth
ocean trench
deep valley in the ocean floor that forms along a subduction zone
oceanic crust
matieral that makes up the ocean floor
Pangea
single landmass thought to ahve been the origin of all continents
Panthalassa
giant ocean surrounding Pangea
plate tectonics
theory that the lithosphere is made up of plates that float on the asthenosphere and that the plates possibly are moved by convection currents
rift valley
steep, narrow valley formed as lithospheric plates seperate
sea floor spreading
movement of the ocean floor away from either side of a mid-ocean ridge.
subduction zone
region where one lithospheric plate move under another
terrane
piece of land with a geologist history distinct from ofd the surrounding land.
theory of suspect terranes
theory that continets are a patchwork of pieces of land that have individual geologic histories
transform fault boundary
boundary formed where two lithospheric plates slide past each other