Plate Tectonics

Term Definition
Continental Drift The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present location.
Pangaea Supercontinent
Sea floor spreading The process by which new oceanic lithosphere forms as magma rises toward the surface sand solidifies.
Plate tectonics The theory that explains how large pieces of the Eartha??s outermost layer, called tectonic plates, move and change shape.
Convergent Boundary The Boundary formed by the collision of two lithospheric plates.
Divergent Boundry 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
Wegener Was a scientist in the early 1900a??s, who wrote a hypothesis on continental drift.
Hot spot
Hot rock from deep within the earth rises, but cooler rock near the surface sinks
A volcanically active area of Earths surface far from a tectonic plate Boundary.
A vent or fissure isna??t he earths surface through which magma and gases are expelled
Mid ocean ridges They are underwater mountain chains that run through earths ocean basins.
Subduction When old ocean crust gets pushed into the asthenosphere, where it is remelted and recycled
Vent An opening at the surface of the earth through which volcanic material passes