The Earth has plates that are constantly moving

A current in a fluid that results from varying densities

When a plate is pulled under another because of gravity

When new rock pushes two plates apart

Boundary where two plates move apart

A long valley with high walls that is a result of divergent plates

Seismically active ridge that causes sea floor spreading

Place where two lithospheric plates meet

Series of volcanoes formed by a convergent plate boundary

Series of islands that result from a convergent plate boundary

Series of mountains that result from a convergent plate boundary

Zone where one plate moves under another plate

Depressions caused by subducting plates

The Puerto Rico Trench

Where two plates slide past each other

Transform boundary defined by a deep trench like valley

Border of Pacific and North American plates