Term Definition
Continental drift is the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
Pangaea is a super continent
Sea floor spreading is the process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies
Plate tectonics are the theory that explains how large pieces of the earths outermost layer, called tectonic plates, move and change shape
Converging boundary is the boundary formed by the collision of two lithospheric plates
Divergent boundary are the boundary between two tectonic plates that are moving away from each other
Transform boundary are the boundary between tectonic plates that are sliding past each other horizontally
Convection currents are the changing in density in circular motions that move the tectonic plates
Wegner He was the man who made up the theory that the continents were once together and formed Pangea.
Volcano is is a vent or fissure in earths surface through which magma and gasses are expelled.
Hot spots are a volcanically active area of earths surface far from a tectonic plate boundary
Mid ocean ridges A long under sea mountain chain that forms where tectonic plates pull apart.
Subduction When two oceanic plates converge, and one is forced under the other
Vent An opening at the surface of the earth through which volcanic materials passes
Plate tectonics

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