KYTL+1.5

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Vocabulary:
driven by convection currents in the mantle or oceanic crust and oceanic crust, or continetal crust and continetal crust
 * Scientific theory**-a well tested concept that explains a wide range of observation
 * Plates**-the lithospere broken into separate sections
 * Plate tectonics**-a geological theory that statesthe piecesof earth's lithosphere are in constant,slow motion,
 * Faults**-breaks in Earth's crust where rocks have slipped past each other
 * Divergent boundary**-where two plates move apart, or diverge, usally occurs in the mid-ocean ridge
 * Transform boundary**-where two plates slip past each other, moving in opposite directions
 * Rift valley**-a deep valley that forms where two plates move apart
 * Collisons**-when two plates converge,it's called a collision, it may bring together oceanic crust and continental crust,

A Theory of Plate Motion

 * the theory of plate tectonics explains the formation, movement, and subduction of Earth's plates
 * pieces of Earth's lithosphere are in slow motion
 * plates move by floating on the top of asthenosphere
 * plates can do a lot:
 * collide
 * pull apart
 * grind past each other

Plate Boundaries

 * three boundaries
 * transform boundaries
 * crust is neither created nor destroyed
 * divergent boundaries
 * when form on land, two of Earth's plates slide apart
 * convergent boundaries
 * when two plates collide, the density of the plates determines which one comes out on top
 * oceanic crust is more dense than continental crust
 * when two plates carrying continental crust collide, subduction doesn't take place

The Continent's Slow Dance

 * plates move 2.5 centimeters per year
 * 225 million years ago, pangaea began to break apart

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