Unit Review Earth's Dynamic Interior

Which layer of Earth is the most dense?

• Crust

• Mantle

• Core

Which layer of Earth is the least dense?

• Crust

• Mantle

• Core

What causes the convection currents in the mantle?

• The less dense (hotter) material rises to the top, eventually the more dense (cooler) material sinks towards the core.

• The more dense (hotter) material rises to the top, eventually the less dense (cooler) material sinks towards the core.

Why does the Earth’s surface move?

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Where does the energy come from that powers the motion in the Earth’s Interior?

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What are the 3 ways plates move?

• Ridge push, slab pull, and convection currents

• Convergent, Divergent, and Transform

• Convection currents, magma flow, and crustal displacement

• Crustal displacement, ridge push, and slab pull

When plates move, the convection currents go in the ______ directions as the plate motion?

• Opposite

• Same

• Perpendicular

• There are no currents

When plates get recycled, the rock...

• Gets recycled and comes up as new rock at the ocean ridge.

• Gets recycled and comes up as old rock at the ocean ridge.

• Goes into the mantle and stays in the mantle.

• Disintegrates into the ocean water.

When looking at the age of crustal rock of the ocean floor,

• The older rock is found by the oceanic trench and newer rock by the mid-ocean ridge.

• The older rock is found by the mid-ocean ridge and newer rock by the oceanic trench.

• All rocks in the ocean floor are the same age.

• The age of the rocks cannot be determined.

What are the effects from the motion of the plates?

• Changes in Earth's magnetic field

• Formation of mountains and ocean trenches

• Changes in the atmosphere

• All of the above