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Vocabulary

 * Scientific theory**: Is a well-tested concept that explains a wide range of observations.
 * Plate tectonics**: Is the geological theory that states that pieces of the Earth's lithosphere are in constant, slow motion, driven by convection currents in the mantle.
 * Faults**: Brakes in the Earths crust where rocks have slipped past each other.
 * Transform boundary**: Is a place where two plates slipped past each other, moving in oposite directions.
 * Divergent boundary**: Is a place where two plates move apart, or diverge.
 * Convergent boundary**: I a place where two plates come together, or converge.

A Theory of Plate Motion

 * The theory of plate tectonics
 * explains the formations, movement, and subduction of the Earths plates.
 * Plates of the lithosphere float on top of the asthenoshere.
 * Plates cannot move without effecting the other plates surrounding it.

Plate Boundaries

 * There are three kinds of plate boundaries:
 * transform boundaries,
 * Earthquakes occur frequently around transform boundaries.
 * divergent boundaries,
 * occur on land and under water,
 * sometimes divergent boundaries can create a rift valley.
 * and convergent boundaries.
 * Convergent boundaries result in a collision.

The Continent' Slow Dance

 * Plates move about one to ten centimeters per year.
 * The North American and Eurasian plates are floating apart at a rate 2.5 centimeters per year.