Science: Plate Tectonics

A break in Earth's crust where rocks have slipped past each other is called a

• plate

• boundary

• layer

• fault

Continental crust consists mainly of the rock

• nickel

• mantle

• basalt

• granite

Scientists rejected Wegener's theory because he could not

• explain why continental crust was denser than oceanic crust

• describe the climate of Pangaea

• explain what force pushes or pulls continents

• describe how seeds moved from Africa to South America

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Subduction is

• the process by which oceanic crust sinks beneath trenches

• the direct transfer of heat through solid materials

• the process that continually adds ocean floor

• a device that bounces sound waves off underwater objects

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Earth's lithosphere is broken into separate sections called

• plates

• trenches

• faults

• rifts

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Scientists who study the forces that make and shape the planet Earth are called

• biologists

• chemists

• geologists

• physicists

In the convection current of a pan of soup, the cooler, denser fluid

• rises to the top

• stays where it is

• sinks to the bottom

• stays on top

The transfer of energy through empty space is called

• subduction

• convection

• radiation

• conduction

Who first proposed the theory of continental drift?

• Harry Hess

• Pangaea

• Alfred Wegener

• Tuzo Wilson

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What erupts through the valley of the mid-ocean ridge?

• molten material

• the lithosphere

• deep-ocean trenches

• continental drift

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