Boundaries

Front

Lithosphere

Back

The rigid outer layer of the Earth, consisting of the crust and upper mantle.

Front

Asthenosphere

Back

The semi-fluid layer of the mantle on which the lithosphere floats.

Front

Plate tectonics

Back

The theory explaining the movement of the Earth's lithosphere through the activity of tectonic plates.

Front

Divergent boundary

Back

A tectonic boundary where two plates are moving away from each other, often resulting in the formation of new crust.

Front

Convergent boundary

Back

A tectonic boundary where two plates are moving towards each other, often resulting in one plate being forced below the other.

Front

Transform boundary

Back

A tectonic boundary where two plates slide past each other horizontally.