According to Wegener's hypothesis of continental drift,

• Earth's surface is made up of seven major landmasses.

• the continents do not move.

• Earth is slowly cooling and shrinking.

• the continents were once joined together in a single landmass.

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What is Pangaea?

• the name of a German scientist

• the name of the supercontinent that existed millions of years ago

• another name for continental drift

• the name of an ancient fossil

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

• landform.

• continent.

• fossil.

• landmass.

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

• satellites

• deep-sea diving

• submarines

• sonar

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

• along the edges of all the continents.

• along mid-ocean ridges

• in deep-ocean trenches.

• at the North and South Poles.

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

• hot.

• moving toward a deep-ocean trench.

• cool.

• closer to the mid-ocean ridge.

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

• conduction.

• earthquakes.

• convection currents in the mantle.

• Earth's magnetic field.

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

• subduction.

• plate tectonics.

• deep-ocean trenches.

• sea-floor spreading.

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

• transform boundary.

• divergent boundary.

• convergent boundary.

• rift valley.

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

• mid-ocean ridge.

• deep-ocean trench.

• rift valley.

• mountain range.

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