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25 Cards in this Set

  • Front
  • Back
continental drift
a hypothesis proposed by Alfred Wegener, stating that the continents had moved and once formed part of a single landmass, which he named Pangaea
convenction
transfer of heat through the movement of heated material
convenction current
movement in a fluid caused by uneven heating
convergent boundary
border formed by the collision of two lithospheric
plates
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
Pangaea
single landmass thought to have been the origin of all continents
Panthalassa
giant ocean surrounding Pangaea
plate techtonics
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 separate
seafloor spreading
movement of the ocean floor away from either side of a mid-ocean ridge
subduction zone
region where one lithospheric plate moves under another
terrane
piece of land with a geologic history distinct from that of the
surrounding land
theory of suspect terranes
theory that continents 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
tectonics
the study of formation of features in the earth's crust (comes from the Greek word tektonikos)
subduct
force
ocean-ocean convergent
one plate goes under, the other goes over (subduction results)
forms trench & island arc
examples: Japan, Philippians, Aleutian Islands, Indonesia, Malaysia
diverge
crust pulls apart
convergent
crust comes together
transform
crust slides past one another
ocean-continental convergent
one plate goes under, the other goes over (example: Andes)