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Dynamic Earth: Charac. of the Seafloor

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Hess expanded on Wegener's theory of _____.
Pangaea landmass
continental drift
conveyor belt
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Terms in this set (32)
Hess expanded on Wegener's theory of _____.
Pangaea landmass
continental drift
conveyor belt
continental drift
Hess proposed the idea that ______ are places where crust is created.

mid-ocean ridges
continents
deep-ocean trenches
mid-ocean ridges
According to Hess's theory, what might happen if the magma under a mid-ocean ridge cools?

The magnetic stripes might reverse direction.
The deep-ocean trench might become deeper.
The crust at the ridge might form more quickly.
The plates on either side of the ridge might stop moving.
The plates on either side of the ridge might stop moving.
What evidence supports Hess's theory of seafloor spreading? Check all that apply.

fossils of the same animals found in different areas
the direction iron in ocean rocks points
the tilt and rotation of the Earth's axis
the age of different rocks on Earth's surface
pillow-shaped rocks found in the sea
the direction iron in ocean rocks points
the age of different rocks on Earth's surface
pillow-shaped rocks found in the sea
How does Earth's magnetic field provide evidence for seafloor spreading?

- It creates a pattern of alternating rock stripes on both sides of a mid-ocean ridge.
- It allows scientists to determine the age of drilling samples.
- It causes magma to harden quickly underwater.
- It shows that younger rocks are located deeper underwater than older rocks.
It creates a pattern of alternating rock stripes on both sides of a mid-ocean ridge.