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plate tectonics

science vocab.

continental drift Wegener's idea that the continents slowly moved over time.
Pangaea one big supercontinent
fossil any trace of an ancient organism that has been preserved in rock.
mid-ocean ridge mountain ranges in the middle of some ocean floors.
sea-floor spreading when mid-ocean ridges continually add new material to the ocean floor.
deep-ocean trench deep underwater canyons.
plates when Earth's lithosphere is broken into pieces separated by cracks.
divergent boundary plates move apart.
convergent boundary plates come together
transform boundary plates slip past each other
plate tectonics plate motions in a single theory.
faults breaks in Earth's crust where rocks have slipped past each other.
rift valley a deep valley
Created by: basketball_12