An enormous gap that forms when new crust cools and moves apart is called a

A ____________ occurs wherever two plates move toward each other.

A ____________ can be used to track some plate movements because it stays in about the same place while the tectonic plate above it keeps moving.

Plates move horizontally past each other along a ____________.

A spreading center is a ____________ on the ocean floor.

Patterns of ____________ recorded in ocean-floor rocks provide evidence of plate movement.

Mid-ocean ridges are sites where old crust sinks into the asthenosphere.

Pangaea was a supercontinent that existed about 200 million years ago.

The transfer of heat by the movement of matter is called conduction.

What are Earth's layers from the center to the surface?

Which of these would make the best model of Earth's crust?

A tectonic plate is a slab of Earth's

Which of these did Wegener use to support his theory of continental drift?

Oceanic crust at a mid-ocean ridge is

Scientists think that the main driving force of plate tectonics is

Which of the following is also known as a spreading center?

Earth's magnetic reversals are recorded in

At transform boundaries, two plates

The Alps are forming as a result of the European and African plates pushing against each other. This is an example of

Many scientists rejected continental drift when it was first proposed because

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