the hypothesis that a single large landmass broke up into smaller land masses to form the continents, which then drifted to their present locations

the boundary between tectonic plates that are colliding

the boundary between two tectonic plates that are moving away from one another

a movement or trembling of the ground that is caused by a sudden release of energy when rocks along a fault move; vibrations of earth's crust

the theory that explains how large pieces of the lithosphere, called plates, move and change shape; modern day continental drift theory

an elastic wave in the earth produce by an earthquake

the boundary between tectonic plates that are sliding past each other horizontally

any activity that includes movement of magma toward or onto Earth's surface

continental drift

• the hypothesis that a single large landmass broke up into smaller landmasses to form continents, which then drifted to their present locations

• the theory that explains how large pieces of the lithosphere move and change shape

• a volcanically active area of Earth's surface, commonly far from tectonic boundary

• vibrations of earth's crust

convergent boundary

• the boundary between tectonic plates that are colliding

• the boundary between two tectonic plates that are moving away from one another

• the boundary between tectonic plates that are sliding past each other horizontally