earths cracke crust
Terms
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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