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Tectonics

QuestionAnswer
Pangea Pangea means all land
continental drift Wegener's hypothesis that all continents had once been joined together
sonar System that uses sound waves to calculate the distance to an object
paleomagnetism As certain rocks form, they acquire the polarity that Earth's magnetic field has at a time.
subduction Ocean floor returns to mantle
sea-floor spreading Process by which plate tectonics produces new oceanic lithosphere at ocean ridges
mid-ocean ridge A long chain of mountains extending the length of the ocean
rift valley a deep central valley of a mid ocean ridge
deep-ocean trench form the deepest of Earth's oceans.
plate Broken up pieces of the Lithosphere
volcanic island arc This newly formed land consiting of an arc-shaped chain of small volcanic islands
continental volcanic arc an arc of continents with volcanos
transform fault boundary a boundary in which two plates slide past each other without creating or destroying lithosphere
divergent boundary Found where two of Earth's plates move apart.
convergent boundary Where to plates come togeather
plate tetonics plates move slowly relative to each other, driven by convection currents in the mantle.
convection current convective flow in the mantle causes tectonic plates to move
ridge-push Lithosphere slides down the Athenosphere
mantle plume A raising column of hot solid mantle rock
slab-pull Pulls the old ocean lithosphere into the mantle.
Created by: Mrs.Stichter
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