magma is melted rock that is under the ground.

The lithosphere is the solid and rigid outer layer of our planet.

Trenches are like extremely deep valleys, just in the ocean instead of on land.

A fault is a fracture, or break, in the Earth's crust

A rift valley is a lowland region that forms where Earth's tectonic plates move apart or rift.

A transform boundary is one where two plates slide past each other.

formation of new areas of oceanic crust, which occurs through the rising of magma at mid-ocean ridges and its subsequent outward movement on either side.

Convection currents are flowing fluid that is moving because there is a temperature or density difference within the material.

The sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.

A convergent boundary is where two tectonic plates push together.

Tectonic plates are broken pieces made of the Earth's crust or lithosphere.

A divergent boundary is an area where two crustal plates are separating.

The mid-ocean ridge is formed where two tectonic plates meet under the ocean.