Plate Tectonics

Term Definition
Continental drift Is the hypothesis thata??s states that the continents once formed a single landmass, broke up, and drifted to their present location.
Sea floor spreading Is the process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies.
Plate tectonics The theory that explains how large pieces of the Earth's outermost layer called tectonic plates move and change shape.
Convergent boundary The boundary 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 are sliding past each other horizontally.
Convection currents The movement of matter due to differences in density.
Pangaea He thought that all of the present continents were once joined in a single huge continent.
Hot spot A volcanically active area of Earth's surface far from a tectonic plate boundary?
Volcano A vent or fissure in the Earth's surface through which magma and gases are expelled.
Wegener One scientist who looked at the pieces of this puzzle was Alfred Wegener.
Mid ocean ridge A long undersea mountain chain that forms along the floor of the major oceans.
Vent An opening at the surface of the earth through which volcanic material passes.
Subduction
When a plate with oceanic crust collides with a plate with continental crust the denser oceanic crust sinks into the Asthenosphere.

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