Plate Tectonics Modified

Front

What is Wegener’s hypothesis of continental drift?

Back

The continents were once joined together in a single landmass.

Front

What causes the movement of Earth’s plates?

Back

Convection currents in the mantle.

Front

What is a transform boundary?

Back

A place where two plates slip past each other, moving in opposite directions.

Front

Why is old oceanic crust more dense than new oceanic crust?

Back

Because it is cool.

Front

What is a fossil?

Back

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

Front

What is the lithosphere?

Back

The rigid outer layer of the Earth, consisting of the crust and upper mantle.

Front

What is the asthenosphere?

Back

The semi-fluid layer of the mantle beneath the lithosphere that allows tectonic plates to move.

Front

What is a divergent boundary?

Back

A boundary where two tectonic plates move away from each other.

Front

What is subduction?

Back

The process where one tectonic plate moves under another plate and sinks into the mantle.

Front

What are tectonic plates?

Back

Large sections of the Earth's lithosphere that move and interact with each other.