Seafloor

How do scientists figure out the age of the seafloor?

• They research it from ancient sea maps that trading vessels would use in the 1700s

• They use the moon phases and eclipses to calculate the age

• They use seismographs and the depth as well as location of earthquakes to calculate the age

• They take drill ships to many locations in the oceans and collect, then date, rock samples. 

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NGSS.MS-ESS2-3

Why does the ocean floor sink beneath the continent at Z?

• The ocean floor is less dense than the continent.

• The ocean floor is more dense than the continent.

• The ocean floor is moving faster than the continent.

• The ocean floor is moving slower than the continent.

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NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

The image shows a mid ocean ridge. What is an important feature of seafloor spreading?

• Mid ocean ridges only occur at convergent boundaries.

• The convection currents in the core drive the plates apart.

• As the plates pull apart, the lava rises to form new crust.

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NGSS.MS-ESS2-1

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

• conduction

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NGSS.MS-ESS2-3

Which of the following objects best represents the movement that occurs during sea-floor spreading?

• Elevator

• Conveyor belt

• Rollercoaster

• Hot air balloon

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NGSS.MS-ESS2-1

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

In the Atlantic ocean, where is the oldest seafloor located?

• Towards the coastlines of the continents

• Towards the middle of the ocean at the mid-ocean ridge

• Towards the north and south poles

• Young seafloor is located randomly throughout the ocean

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NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

What is occurring at the red arrows on the image.

• Uplifting

• Subduction

• Mountain building

• Erosion

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NGSS.MS-ESS2-2

Which of the following supports the theory of seafloor spreading?

• Correlation of rock layers

• Crustal Age

• Magnetic Reversal

• Continuous Mountain Chains

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NGSS.MS-ESS2-3

What 3 kinds of evidence were used to prove that the seafloor spread?

• Rock formations, age of rocks, WWII shipwrecks

• Age of rocks, magnetic seafloor stripes, WWII ship logs

• Rock formations, magnetic seafloor stripes, age of rocks

What evidence helps scientists show how sea floor spreading occurs?

• Ocean Floor Material

• Magnetic Stripes

• Drilling Samples

• All of the Above