An underwater mountain chain where new ocean floor is formed:

Valley that forms where 2 plates move apart:

The process by which molten material adds new oceanic crust to the ocean floor:

Area where an oceanic plate sinks down into the asthenosphere at a convergent boundary (usually between continental and oceanic plates):

A break in the earths crust:

The boundary between tectonic plates that are sliding past eachother:

What was the theory that the continents were once joined together in a single land mass?

How many years ago did Pangaea exist?

Current in earths mantle that transfers heat in earths interior and is driving force for tectonic plates

A plate boundary where 2 plates are moving AWAY from eachother:

When 2 continential plates collide/moving towards eachother (and usually creating mountains)

Chronological Collection of life’s remains that have been analyzed:

Deep valley in the ocean floor that forms along a subduction zone:

The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations