The idea that the continents slowly moved over Earth's surface

The supercontinent that all current continents were once a part of

Any trace of an ancient organism that has been preserved in rock

Mountain ranges that run along the middle of some ocean floors

The process by which mid-ocean ridges continually add new material to the ocean floor

Deep underwater canyons where the oceanic crust bends downward

Pieces of the Earth's crust

A boundary where the plates move apart

A boundary where plates come together

A boundary where plates slip past each other

The theory that states that Earth's plates are in slow, constant motion, driven by convection currents in the mantle

A deep valley formed when pieces of Earth's crust diverge on land

Breaks in the Earth's crust where rocks have slipped past each other

The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle again

The oldes crust is located

Africa and South America look like they fit together.

Oceans with many trenches shrink.

The plates ride along

Which crust will sink?

Fossils of Glossopteris are found on several continents.

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