Term Definition
Continental drift The hypothesis that states the continents once formed a single landmass, broke up, and drifted to their present locations.
Pangea Was a supercontinent that existed 65 million years ago
Sea floor spreading The process by which a new oceanic lithosphere forms as magma rises toward the surface and solidify.
Plate tectonics The theory that the earths lithosphere Ia??d divided into tectonic plates.
Convergent boundary The two tectonic plates collide
Divergent boundary The boundary between two tectonic plates that are moving away from each other.
Transform boundary The boundary between tectonic plates that are sliding each other horizontally.
Convection currents The cycle of warm air rising and cool air sinking causes a circular movement of air.
Volcano A vent or fissure in the earths surface.
Mid oceam ridges
Mid ocean ridges A long, undersea mountain chain that forms along the of the major oceans
Alfred Lothar Wegener was a German polar researcher, geophysicist and meteorologist. During his lifetime he was primarily known for his achievements in meteorology and as a pioneer of polar research.
A volcanically active area of earth's surface far from a tectonic plate boundary.
Subduction Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced or sinks due to gravity into the mantle.
Vent An opening at the surface of the earth through which volcanic material passes
Plate tectonics

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