Seafloor Spreading

Where would the oldest rock be found?

• L
• M
• N
• O

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

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

Seafloor spreading...

• creates new oceanic crust

• destroys or recycles crust

• creates new continental crust

• creates old crust

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

The study of the Earth's magnetic record is called

• ridge push

• convection

• paleomagnetism

• subduction

A change in Earth' s magnetic field is called a

• magnetic reversal

• subduction

• paleomagnetism

• slab pull