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Plate Tectonics

Ch. 3; Section 3, 4, 5

TermDefinition
continental drift hypothesis that the continents were once all joined together in a single landmass and have since drifted apart.
Pangaea supercontinent formed when all the continents were joined together
fossil any trace of an ancient organism preserved in rock
mid-ocean ridge a system of underwater mountain systems that wind beneath Eart's oceans
sonar a device that bounces sound waves off underwater objects and then records the echoes to determine distance of the object
sea-floor spreading theory that the sea floor spreads apart along both sides of the mid-ocean ridge as new crust is added
deep-cean trench canyon where the oceanic crust bends downward
subduction the process by which ocean floor sinks beneath a deep-ocean trench and back into the mantle
plates sections that the lithospheric plate is broken into
scientific theory well-tested concept that explains a wide range of observations
plate tectonics theory that explains the formation, movement, and subduction of Earth's plates
faults breaks in Earth's crust where rocks have slipped past each other
divergent boundary place where two plates move apart
rift valley deep valley that forms along a divergent boundary
convergent boundary place where two plates come together in a collision
transform boundary place where two plates slip past each other, moving in opposite directions
Created by: pkolarich
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