The Theory of Seafloor Spreading

Where would the oldest rock be found?

• L
• M
• N
• O

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NGSS.MS-ESS1-4

How is it possible for new crust to be formed without increasing the surface area of the Earth?

• Crust is recycled in subduction zones at the same time it is created at mid-ocean ridges

• New crust is underwater where it sinks

• New crust breaks more easily than old crust

• The oldest crust just breaks apart as the plates move

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NGSS.HS-ESS1-5

NGSS.HS-ESS2-1

The average density of continental crust is 2.8 g/cm³ and the average density of oceanic crusts is 3.2 g/cm³. If these two plates came together, what would happen?

• The two plates would push apart and form a rift zone.

• The oceanic plate would rise up over the continental plate.

• The oceanic plate would sink under the continental plate.

• The two plates would meet head on and rise up to form mountains.

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NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

At its oldest, ocean crust is about __________ years old

• 300-350 million

• 180-200 million

• 3.5 billion

• 10-20 million

The OLDEST seafloor is located

• closest to the mid-ocean ridge.

• farthest from the mid-ocean ridge.

• east of Hawaii

• west of California

Which of the following supports the theory of seafloor spreading?

• Correlation of rock layers

• Crustal slab pull

• Magnetic reversals recorded in rocks

• Continuous mountain chains

Rock at the mid ocean ridges...

• is the oldest rock on the earth.

• is older than continental rock.

• is younger than continental rock.

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

• Towards the edges, near the eastern and western continents
• Towards the middle of the ocean
• Towards the north and south poles
• Young seafloor is located randomly throughout the ocean

The magnetic pattern of ocean-floor rocks on one side of an ocean ridge is_____________.

• a mirror image of that on the other side

• younger than other side

• much different pattern

• at right angles to the ridge

A change in Earth' s magnetic field is called a

• magnetic reversal

• subduction

• paleomagnetism

• slab pull