"___________" is the name given to the single landmass that began to break apart about 300 million years ago and gave rise to today's continents.

A ____________ is any trace of an ancient organism that has been preserved in rock.

___________ is an undersea mountain chain where new ocean floor is produced.

_____________ is the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle.

____________ is a section of the lithosphere that slowly moves over the layer beneath it, carrying pieces of continental and oceanic crust.

__________ are plates that move apart.

____________ are plates that come together.

__________ are plates that slide past each other.

____________ plates are in slow, constant motion, driven by convection currents in the mantle.

_____________ is the transfer of heat by the movement of a fluid (liquids and gases).

___________ is the upward movement of warm fluid and the downward movement of cool fluid.

______________ is the same structure as a normal fault, but the blocks move in the reverse direction.

______________ is a steep, cone-shaped hill or small mountain made of volcanic ash, cinders, and bombs piled up around a volcano's opening.

_________ are tall, cone-shaped mountains in which layers of lava alternate with layers of ash.

___________ forms when magma hardens in a volcano's pipe and the surrounding rock later wears away.