Seafloor Spreading

______ is a device that bounces sound waves off underwater objects and then records the echoes of these sound waves.

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NGSS.MS-PS4-2

How are mid-ocean ridges similar to a baseball?

An American geologist who studied mid-ocean ridges to aid with continental drift theories.

• Alfred Wegener

• Harry Hess

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NGSS.HS-ESS1-5

NGSS.HS-ESS2-1

Seafloor spreading continually adds new material to the ocean floor.

• True

• False

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NGSS.MS-ESS2-3

What occurs during seafloor spreading?

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NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

All of these are evidence of seafloor spreading EXCEPT

• Eruptions of molten material

• Earthquakes

• Magnetic stripes of rock on the ocean floor

• The ages of rocks

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NGSS.MS-ESS2-3

How did the weird toothpaste shaped rocks that formed when molten material hardens show about seafloor spreading?

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NGSS.MS-ESS2-3

Scienetists discovered that the rock that makes up the ocean floor lies in a pattern of magentised "stripes." These hold a record of reversals in Earth's magnetic field.

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NGSS.MS-ESS2-3

The farther away from a ridge the samples were taken, the older the rocks were. The youngest rocks were always in the center of the ridges.

• True

• False

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NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

The ocean floor plunges into deep water canyons called ____ _____ trenches. At these trenches, the oceanic crust bends down.

Tags

NGSS.MS-ESS2-3