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16 terms

SJA Van Plate Tectonics Ch. 10

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continental drift
The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
Pangaea
A large "supercontinent" that is believed to have connected all of the continents on earth about 225 million years ago.
seafloor spreading
The process that creates new sea floor as plates move away from each other at the mid-ocean ridges
plate tectonics
A theory stating that the earth's surface is broken into plates that move.
plates
Large section of Earth's oceanic or continental crust and rigid upper mantle that moves around on the asthenoshpere
lithosphere
rigid layer of earth made up of the crust and the upper part of the mantle
asthenosphere
The solid, plastic layer of the mantle beneath the lithosphere; made of mantle rock that flows very slowly, which allows tectonic plates to move on top of it
convection current
Cycle of heating, rising, cooling, sinking that makes plates move.
mantle
largest layer of rock between Earth's crust and core containing the lithosphere and asthen0sphere
converge
A boundary where plates are coming towards each other
diverge
A boundary where the plates are moving away from each other.
transform
A boundary where the plates are sliding past each other
plastic-like
not completely solid or liquid; capable of being molded or changing form
oceanic crust
earth's crust located under the ocean
continental crust
The portion of the earth's crust that is less dense than oceanic crust
subduction
The process by which an oceanic tectonic plate sinks under another plate into Earth's mantle; when one plate sinks beneath another