Chapter 3

According to Wegener's hypothesis of continental drift,

• Earth is slowly cooling and shrinking.

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

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

What is Pangaea?

• the name of the German scientist

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

• another name for the continental drift

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

• landform

• continent

• fossil

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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

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

• hot

• moving toward a deep-ocean trench

• cool

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

• conduction

• earthquakes

• convection currents in the mantle

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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

What did scientists in a submersible see when the observed the mid-ocean ridge?

• a convergent boundary

• rocks formed by the rapid hardening of molten material

• the movement of Earth's plates

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

• convection

• continental drift

• subduction

A rift valley forms at a

• convergent plate boundary

• divergent plate boundary

• transform boundary

Tags

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