PLate Tectonics: The theory that pieces of earths lithosphere are in consistant motion driven by convection currents in mantle.

Earthquakes: Shaking or trembling of the earth

Volcanoes: Opening from earths crust from which molten material and steam come out

Stress: A force that acts on a rock to change its shape and form

Albina: A type of material

Plate boundary. An area that surrounds a plate.

Mid-ocean Ridge:

Molten Material: A type of hot material

Magma: Lava before it comes out of a volcano