Chapter 7 - Plate Tectonics Review

Scientists at the time rejected Wegner’s hypothesis of continental drift because he could not explain how or why Earth’s continents move.

• True

• False

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NGSS.HS-ESS1-5

As new sea floor moves away from an ocean ridge, the sea floor cools and becomes less dense than the material beneath it.

• True

• False

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According the theory of plate tectonics, plates interact at plate boundaries by bouncing off of each other, moving away from each other, or moving horizontally past each other. _______________

• True

• False

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NGSS.MS-ESS2-3

The weight of a subducting plate helps to pull the lithosphere into a subduction zone in a process called ridge push. ______________________________

• True

• False

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NGSS.HS-ESS2-1

Plates slide past one another at ____.

• subduction zones

• transform boundaries

• convection currents

Seafloor spreading occurs because ____.

• new material is being added to the asthenosphere

• sediments accumulate at the area of spreading

• molten material beneath Earth's crust rises to the surface

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NGSS.MS-ESS2-2

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The boundary between two plates moving together is called a ____.

• divergent boundary

• convergent boundary

• transform boundary

• lithosphere

Wegener believed that the continents were assembled as part of a supercontinent about ____ years ago.

• 250 million

• 300 million

• 400 million

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NGSS.HS-ESS1-5

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The driving forces of tectonic plates are related to convection currents in Earth’s ____.

• crust

• mantle

• core

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NGSS.MS-ESS2-3

A lack of explanation for continental drift prevented many scientists from accepting that a single supercontinent called ____ once existed.

• Glomar

• Glossopteris

• Pangaea