Term	Definition
	theory	an unproven idea
	continental drift	the theory that says that the continents were joined together at one time but that over millions of years the continents have split, drifted apart, collided, and joined together to create new formations.
	crust	the thin, outer surface of the earth
	mantle	the layer of earth on which the crust floats
	core	the innermost layer of the earth
	tectonic plates	the sections of the earth's crust that move independently (by themselves)
	rift	a separation of the earth's crust
	folding	this happens when the earth's crust buckles in a wavelike pattern, creating hills or mountains
	fault	a break in the earth's crust where earthquakes can happen
	lava	hot molten rock at the earth's surface
	magma	hot molten rock in the mantle (inside the earth)
	earthquake	shaking of the earth's crust caused by tectonic plate movement
	volcano	this happens when tectonic forces cause the mantle to explode up to the earth's surface.
	Alfred Wegener	he developed the theory of continental drift
	San Andreas	this is a major system of faults in California where many earthquakes happen.
	Montserrat	this is a Caribbean Island that was evacuated due to a volcano
	Mt. St. Helens	this volcano erupted May 18, 1980 in Washington
	New Madrid	this is a site of major earthquakes in 1811-1812 in Missouri
	ring of fire	this is a highly active volcanic area around the Pacific Ocean
	tsunami	this is a large wave caused by earthquakes

You can listen to the words and definitions as many times as you want or need to learn them. When you are finished, go back to Task 1 and read step 2.