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Chapter 3 Review

continental drift Wegener's idea that the continents slowly moved over Earth's surface.
Pangaea A supercontinent that Wegener named.
fossil Any trace of an ancient organism that has been preserved in rock.
mid-ocean ridge Form large chains of mountains that rise up from the ocean floor.
sea-floor spreading Adds more crust to the ocean floor. At the same time older strips of rock move outward form either side of the ridge.
deep-ocean trenches In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.
subduction the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle again.
divergent boundary where plates move apart from each other
convergent boundary where plates come together and COLLIDE (with no big explosions to watch D;)
transform boundary where plates slip past each other
plate tectonics the theory of pate tectonics states that Earth's plates are in slow, constant motion, driven by convection currents in the mantle
fault breaks in Earth's crust where rocks have slipped past each other
rift valley where pieces of Earth's crust diverge on land
Created by: dogs00dogs