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Continental Drift
The gradual movement of the continents across the earth’s surface through geological
time.
Tectonic Plate
A block of lithosphere that consists of the crust and the rigid, outermost part of the
mantle.
Convergent Boundary
The boundary between tectonic plates that are colliding.
Divergent Boundary
The boundary between two tectonic plates that moving away from each other.
Transform Boundary
The boundary between tectonic plates that are sliding past each other horizontally.
Convection Currents
Any movement of matter that results from difference in density; may be vertical,
circular, or cyclical.
Subduction Zone
The zone where one lithospheric plate moves beneath another plate as a result of
tectonic forces.
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