8th Grade Plate Tectonics Test Review

According to Wegener’s hypothesis of continental drift,

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

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

• Earth is slowly cooling and shrinking.

• the continents do not move.

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

• at the north and south poles.

• along the edges of all the continents.

• in deep-ocean trenches.

• along mid-ocean ridges.

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Holes drilled several kilometers in Earth’s crust provide direct evidence about Earth’s interior in the form of

• rock samples

• volcanic eruption

• liquid iron

• seismic waves

The place where two plates come together is known as a

• divergent boundary.

• transform boundary.

• convergent boundary.

• rift valley.

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

• subduction.

• convection.

• conduction.

• continental drift.

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Using data from seismic waves, geologists have learned that Earth’s interior is made up of several

• trenches

• layers

• ridges

• continents

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

• landform

• landmass

• continent

• fossil

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Geologists obtain indirect evidence about Earth's interior by

• directly looking under the many layers.

• estimating temperature inside earth.

• measuring pressure differences at Earth's surface

• recording and studying seismic waves

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Most geologists rejected Alfred Wegener's idea of continental drift because

• Wegener could not prove how the continents moved

• Wegener was interested in what Earth was like millions of years ago.

• They were afraid of a new idea.

• Wegener used several different types of evidence to support his hypothesis.

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

• by measuring how fast sea-floor spreading occurs

• by mapping rocks on the sea floor using sonar

• by determining the age of rock samples obtained by drilling on the sea floor

• by observing eruptions of molten material on the sea floor

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