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30 terms

Chapter 8, Plate Tectonics

This is the set of cards for Chapter 8, Plate Tectonics.
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tectonics
The theory that describes the formation, movements, and interactions of plates is called plate _?_.
continental drift
The hypothesis that says that the continents have move or drifted from one place to another.
Wegener
The German scientist who proposed the hypothesis of continental drift.
shape of the continents and fossil evidence
Early evidence that backed Wegener's hypothesis of continental drift
Mesosaurus
A reptile that lived 270 million years ao, and its remains are found only in parts of South America and Africa.
mid-ocean ridge
A long of chain of voclanic mountains on the ocean floor with a deep central valley.
magnetic record
Information about magnetic reversals stored in bands of igneous rocks on the ocean floor that lie on both sides of a mid-ocean ridge
evidence that new rock is being formed as plates move apart
The rocks along mid-ocean ridges are unusually warm. The amount of heat leaving the rocks decreases as you move further from the mid-ocean ridges.
divergent boundary
A boundary between two lithospheric plates that are moving apart.
rift valleys
Deep valleys at the center of a mid-ocean ridge.
convergent boundary
A boundary between two plates that are moving toward each other.
subduction boundary
The boundary between two plates where one plate plunges beneath another.
deep-sea trench
A long, deep trench that forms along a subduction boundary.
Mariana
The _?_ Trench is an example of a deep-sea trench.
collision boundary
The boundary that forms when two continents collide and are welded into a single, larger continent.
Himalayas
An example of a land form caused by a collision boundary.
transform boundary
A boundary between two plates that are sliding past each others.
San Andreas fault
An example of a transform boundary.
mantle convection
A model of how moving magma circulating in the Earth helps move plates.
ridge push
The older, denser lithosphere slides away from the ridge and helps push the plates apart.
slab pull
The force that a sinking edge of a subducting plate exerts on the rest of the plate.
Pangaea
The name given to the landmass when all the continents were welded together.
craton
A name for an ancient continental core
deep-sea sediments
Sediments from the ocean floor that is scrapped off and left behind as an oceanic plate plunges under a continental plate at a subduction boundary
igneous rock
A source of growth material that comes from magma and volcanoes.
river sediments
A source of growth material that consists of the sediments that are deposited by rivers that flow off of the continents
terrane
A large block of lithospheric plate that has been moved, often over a distance of thousands of kilometers, and attached to the edge of a continent.
western coast of South America
A good example of ocean-continent subduction.
Mid-Atlantic Ridge
A good example of sea floor spreading.
satellite laser ranging
A technique which is used to measure the distance that the continents are currently moving.