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9 10.1 Moving Contin

Ch 10.1 Moving Cont

TermDefinition
Asthenosphere a layer of 'plastic' semi-solid rock in the lower mantle
Continental Drift the separating of continents by drifting across the oceans - the break-up of Pangaea into Laurasia and Gondwana
Magnetic striping patterns of magnetism trapped in rocks on each side of plate boundaries
Ocean trench a deep trench or downward fold in the ocean floor that is much deeper than the surround sea bed - the Mariana Trench near Japan
Plate tectonics the theory that the Earth's crust is cracked into many large pieces that move on the asthenosphere - like the skin on custard
Rifting the process of continents breaking up, subsiding and then allowing in the ocean - eg the Great Rift Valley of East Africa
Seafloor spreading the process of new crust forming at the mid-ocean ridges and spreading outwards - eg the mid-Atlantic Ridge between the Americas and Europe/Africa
Subduction where the crust is sinking down into the earth - usually an oceanic plate sliding beneath a continental plate eg the Pacific plate sliding under Asia
Created by: camwust
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