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Plates

Any of the large movable segments in which the earth's lithosphere is divided according to the theory of plate tectonics.

Tectonics

A branch of geology concerned with the structure of the crust of a planet (as Earth) or moon and especially with the formation of folds and faults.

Theory

A scientifically acceptable general principle or body of principles offered to explain a phenomena.

Scientific Fact

A piece of scientific information about something presented as true and accurate.

Law

A rule or principle stating something that always works in the same way under the same conditions.

Theory of Plate Tectonics

A theory in geology: the lithosphere of the Earth is divided into a small number of moving plates whose movements cause seismic activity.

Convergent Boundary

The area where two tectonic plates bump into each other or pull apart.

Divergent Boundary

The area where two tectonic plates pull away from each other and new rock is formed.

Transform Fault

The area where two tectonic plates meet and slide horizontally.

Ocean Basin

Anywhere on Earth that is covered by seawater.

Subduction

The process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate, sinking into the Earth's mantle, as the plates converge.

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