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21 Cards in this Set

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continental-continental plate boundary
a convergent plate boundary along which two continental lithospheric plates collide, such as the collision with India and Asia
continental drift
the theory that the continents were once joined into a single landmass that broke apart with the various fragments (continents) moving with respect to one another
convergent plate boundary
the boundary between two plates that are moving toward one another, three types of convergent plate boundaries are recognized
Curie point
the temperature at which iron-bearing minerals in a cooling magma or lava attain the magnetism
divergent plate boundary
the boundary between two plates that are moving apart
Glossopteris flora
a late Palwozoic association of plants found only on the Southern Hemisphere continents and India
Gondwana
one of six major Paleozoic continents composed of present-day continents of South America, Africa, Antarctica, Australia, and India and parts of other continents such as Southern Europe, Arabia, and Florida
hot spot
a localized zone of melting below the lithosphere
Laurasia
a late Paleozoic, Northern Hemisphere continent composed of the present-day continetns of North America, Greenland, Europe, and Asia
magnetic anomaly
any change, such as a change in average strength of Earth's magnetic field
magnetic reversal
the phenomenon in which the north and south magnetic poles are completely reversed
oceanic-continental plate boundary
a convergent plate boundary along which oceanic lithosphere and continental lithosphere collide; characterized by subduction of the oceanic plate beneath the continental plate and by volcanism and seismicity
oceanic-oceanic plate boundary
a type of convergent plate boundary along which two oceanic lithospheric plates collide and one is subducted beneath the other
paleomagnetism
the remnant magnetism in rocks, studied to determine the intensity and direction of Earth's past magnetic field
Pangaea
the name Alfred Wegener proposed for a super continent consisting of all Earth's landmasses that existed at the end of the Paleozoic era
plate
an individual segment of lithosphere that moves over the asthenosphere
plate tectonic theory
the theory that large segments of the outer part of Earth (lithospheric plates) moves relative to one another
seafloor spreading
the theory that the seafloor moves away from spreading ridges and is eventually consumed at subduction zones
thermal convection cell
a type of circulation in the asthenosphere during which hot material rises, moves laterally, cools and sinks and is reheated and continues the cycle
transform fault
a fault along which one type of motion is transformed into another; commonly displaces oceanic ridges, but movements on opposite sides of the fault between displaced ridge segments is the opposite of the apparent displacement; on land recognized as a strike-slip fault, such as the San Andreas fault
transform plate boundary
plate boundary along which plates slide past one another and crust is neither produced nor destroyed; on land recognized as a strike-slip fault