According to Wegener's hypothesis of continental drift,

What is Pangaea?

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

What technology did scientists use in the mid-1900s to map the mid-ocean ridge?

In sea-floor spreading, molten material rises from the mantle and erupts

Old oceanic crust is more dense than new oceanic crust because it is

Most geologists think that the movement of Earth's plates is caused by

The geological theory that states that pieces of Earth's lithosphere are in constant, slow motion is the theory of

A place where two plates slip past each other, moving in opposite directions, is known as a

A collision between two pieces of continental crust at a convergent boundary produces a

How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?

Wegener believed that the continents had once been joined in one landmass called ________.

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

A rift valley forms at a

The place where two plates come together is known as a

If subduction occurs faster than oceanic crust can be created, an ocean will

Oceanic crust near the mid-ocean ridge is ___________ than oceanic crust farther away from the ridge.

The hypothesis of _______________ was that all the continents once were joined as a single supercontinent and have since drifted apart.

The process of __________________ continually adds new crust to the ocean floor along both sides of the mid-ocean ridge.

The lithosphere is broken into sections called ________________, which float on top of the asthenosphere.

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