Term Definition
Continental Drift A hypothesis that states that the continents once formed a single landmass, broke up, and then drifted to their present location
Pangaea The super continent. The theory that the world was a huge continent
Sea Floor Spreading The process by which new oceanic lithosphere forms as magma then rises to the surface and solidifies
Plate Tectonics The theory that the Lithosphere is divided into Tectonic Plates which move on top of the Asthenosphere
Convergent Boundary The boundary that is formed by the collision of two lithospheric plates
Divergent Boundary The boundary between two tectonic plates that are moving away from each other
Transform Boundary The boundary between tectonic plates that slide past one another
Convection Currents The changing in density in circular motions that move the tectonic plates
Wegener A scientist that discovered the theory of continental drift.
Hot Spot A volcanically active area on the Earth that is far from tectonic plates boundaries
Volcano Areas of the Earth where magma and volcanic gases pass
Mid-Ocean Ridges A long, undersea mountain chain that forms along the floor of major oceans
Subduction When the denser crust sinks and the less dense crust rises above
Vent An opening at the surface of the Earth which magma flows
Plate Tectonics

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