Earth Science A Unit 1

How do the magnetic patterns on the seafloor support the theory of tectonic plates?

• The magnetic patterns prove that the seafloor is old, which is what the plate tectonic theory suggests.

• The magnetic patterns are formed by earthquakes, which the plate tectonic theory says occur in oceans.

• The magnetic patterns on each side of the ocean ridge are symmetrical, which proves that the seafloor is spreading.

• The magnetic patterns prove that the seafloor does not move; only the continents do.

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NGSS.HS-ESS1-5

Which of the following best summarizes the plate tectonic theory?

• Earth’s crust is divided into moving pieces that collide with each other, creating mountain ranges, ocean ridges, and ocean trenches.

• Billions of years of earthquakes and volcanoes have divided Earth’s crust into large and small pieces

• Earth is divided into pieces that go deep to its core; the pieces are pushed around by lava from the earth’s core. Earth is divided into pieces that used to move, forming trenches, mountains and ridges, but the pieces do not move anymore.

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NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Scientists expected ocean floors to have a thick layer of sediment; however, when they checked, they discovered that ocean floors have very thin layers of sediment. What did this tell them about ocean floors?

• There is a lot of wave action that stops sediment from settling on the seafloor.

• Continental land is not eroding as quickly as scientists thought it was.

• Ocean floors are not as old as they thought they were.

• There are no volcanoes in the ocean.

How do volcano and earthquake patterns support the idea of plate tectonic theory?

• They are usually found near the borders of plates, which is where plates slide against each other and create stress in the crust.

• They are usually found in the center of plates, which is where plates are coming apart and experiencing a lot of stress.

• They are usually found on land, which is where plates are coming apart and experiencing a lot of stress.

• Most are found on larger continents, and according to the theory, larger continents are still in the process of breaking up.

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NGSS.MS-ESS2-3

NGSS.MS-ESS3-2

Africa is famous for its gold mines. According to evidence that supports the theory of plate tectonics, where would be the best place to look for similar deposits of gold?

• A

• B

• C

• D

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NGSS.MS-ESS2-3

NGSS.MS-ESS3-1

Which of the following best describes what happens at a divergent plate boundary?

• The plates smash together and create mountains because neither plate is subducted.

• The plates separate from each other creating new seas or lakes.

• The plates separate from each other creating new crust in the process.

• The plates move together and a trench is formed where one plate subducts.

Why are mountain ranges created where two continental plates converge?

• One plate is subducted—pushing the crust of the other plate up.

• One plate is subducted, but its crust remains to form a mountain range.

• Both plates are subducted—forcing the land up around them.

• Neither plate is subducted; instead, both are lifted up forming a mountain range.

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NGSS.HS-ESS1-5

NGSS.HS-ESS2-1

In which of the following types of plate boundaries is new crust formed?

• continent-continent convergent boundary

• ocean-continent convergent boundary

• transform boundary

• divergent boundary

In which of the following types of plate boundaries is the crust neither created nor destroyed?

• ocean-ocean convergent boundary

• transform boundary

• ocean-continent convergent boundary

• continent-continent convergent boundary

In which of the following types of plate boundaries are continental mountain ranges created?

• divergent boundary

• transform boundary

• ocean-ocean convergent boundary

• continent-continent convergent boundary

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NGSS.HS-ESS2-1