Theory that states that Earth's surface is made of rigid slabs of rock that move with respect to each other.

The process by which new oceanic crust forms along mid-ocean ridges.

The process that occurs when one tectonic plate moves under another tectonic plate.

Long, narrow mountain range on the ocean floor; formed by magma at divergent plate boundaries.

Material in the mantle constantly rises as it is heated becomes less dense and falls as it cools and becomes more dense.

Where is new lithosphere (crust) formed?

This type of boundary has tectonic plates that slide past each other and often cause earthquakes.

Where is old lithosphere (crust) returned to the mantle?

Marie Tharp discovered this feature on the ocean floor which help prove Plate Tectonic theory.

The boundary between two plates that move away from each other.

The boundary between two plates that move toward each other.