Plate tectonics

Term Definition
Continental drift The hypothesis that states that the continental once formed a single landmass, broke up, and drifted to their present locations
Pangaea Is Greek for a??all eartha??
Sea-floor spreading The process by which new oceanic lithosphere forms magma rises toward the surface and solidifies
Plate tectonics The theory that explains how large pieces of the earths outermost layer , called tectonics plates , move and change shape
Convergent boundary The boundary formed by the collision of two lithosphere plates
Divergent boundary The boundary between two tectonics plates that are moving away from each other
Transform boundary The boundary between tectonics plates that are sliding past each other horizontally
Convection currents
a current in a fluid that results from convection
Wegener
Volcano A vent or fissure in the earth surface through which magma and gases are expelled
Hot spot A volcanically active area of earth surface far from a tectonic plate boundary
Mid-Ocean ridge A long undersea mountain chain that forms along the floor of the major oceans
Subduction the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
Ita??s the forced that moved the continents
Vent An opening at the surface of the earth through which volcanic material passes

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