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?

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

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