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26 Cards in this Set
- Front
- Back
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giant ocean surrounding pangea; meaning "all lands"
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panthallassa
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single landmass thought to have been the origin of all continents; meaning "all lands"
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pangea
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about 250 million years ago, all 7 continents were joined, called pangea
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continental drift
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hypothesis stating that the continents once formed a single landmass, broke up, and drifted to their present locations
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continental drift
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a small, extinct land reptile that lived 270 million years ago
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mesosaurus
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underseas mountain range with a steep, narrow valley along its center
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Mid-Atlantic Ridge
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system of undersea mountain ranges that wind around the earth
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mid-ocean ridges
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movement of the ocean floor away from either side of a mid-ocean ridge
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seafloor spreading
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natural remanent magnetism nearly identical to the present ambient field
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normal polarity
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natural remanent magnetism opposite that of the present geomagnetic field
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reversed polarity
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zone of mantle beneath the lithosphere that consists of slowly
flowing solid rock |
asthenosphere
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material that makes up landmasses
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continental crust
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of heat through the movement of heated material
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convection transfer
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movement in a fluid caused by uneven heating
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convection current
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border formed by the collision of two lithospheric
plates |
convergent boundary
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boundary formed by two lithospheric plates that are
moving apart |
divergent boundary
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chain of volcanic islands formed along an ocean trench
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island arc
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thin outer shell of the Earth consisting of the crust and the rigid
upper mantle |
lithosphere
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deep valley in the ocean floor that forms along a subduction
zone |
ocean trench
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material that makes up the ocean floor
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oceanic crust
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theory that the lithosphere is made up of plates that float on the
asthenosphere and that the plates possibly are moved by convection currents |
plate tectonics
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steep, narrow valley formed as lithospheric plates separate
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rift valley
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region where one lithospheric plate moves under
another |
subduction zone
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piece of land with a geologic history distinct from that of the
surrounding land |
terrane
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theory that continents are a patchwork of pieces
of land that have individual geologic histories |
theory of microplate terranes
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boundary formed where two lithospheric plates slide past
each other |
transform boundary
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