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12 Cards in this Set

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plates
earths crust and upper mantle are broken in to enourmous slabs
crust
earths most outer layer
mantle
layer in the earth between the crust and the core
earthquake
when to plates of earth slide in oppiste derections
sea-floor spreading
process when a new ocean floor is continually being added
magnetic field
area around a magnet where the effects are felt
magnetic reversal
when magnetic field flips or reverses from time to time
plate boundries
places where plates interact
theory of plate tectonics
the teory that earth's lithoshere is broken into enormous slabs or plates that are in motion
tectonic plates
{look at def. of plates}
theory of contenentil drift
a theory that states that continents formed a single land mass at one time in the past and have drifted over time to thier present postions
pangaea
all land