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what are plate tectonics?
- theory that explains not only the movement of the continents but also the changes in he Earth
- s crust ccaused by internal forces
riid blocks of the Earth's crust and upper mantle
consists of nine large and several small plates
rigid solid blocks of earths crust and upper mantle
currents of hot mantle rock rise and separate at this point creating new ocean crust at the rate of two to ten centimeters per year
oceanic crust collides with either another oceanic plate or a continental plate
created when two plates slide past one another
process where the crust is forced apart and boundaries are formed
Red Sea was created this way and this is also the process that broke up Pangaea and created the Atlantic ocean
oceanic plates slide under lighter continental plates and plunges into the mantle
forms a trench
created when two plates slide sideways past each other
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