8th Unit 2 Review Assessment

Earth's outer layer is divided into sections called (a)   .

• plates

• mantle

The plates on Earth's outer layer:

• move

• stop

• move back and forth

Earth's plates move on the _______ of a soft, solid layer of rock called the _______.

• top, underneath

• bottom, crust

• surface, mantle

• edge, core

At ______ plate boundaries, rock rises from the mantle and hardens, adding new solid rock to the edges of both plates.

• convergent

• divergent

At ______ plate boundaries, one plate moves underneath the other plate and sinks into the mantle.

• divergent

• convergent

Earth's plates travel at a rate too ______ to be experienced by humans.

• slow

• fast

It takes a ______ time for Earth's plates to travel great distances.

• long

• short

Which statement best describes what Earth's outer layer is like underneath the surface in the image?

• Underneath both the soil and the ocean, Earth's outer layer is made of sand and water.

• Underneath both the soil and the ocean, Earth's outer layer is made of hard, solid rock.

• Underneath the soil, Earth's outer layer is made of hard, solid rock. Underneath the ocean, Earth's outer layer is made of sand.

• Underneath the soil, Earth's outer layer is made of water.

Refer to the map showing the locations of Lystrosaurus fossils in India and South Africa. What could explain how these fossils got so far apart?

• India and South Africa are parts of different plates. The plates slowly moved far apart as soft, solid rock from underneath got added to the edges of the plates over millions of years.

• India and South Africa are parts of different plates. The plates floated away from each other across the ocean.

• India and South Africa are parts of different plates. The plates slowly moved apart as new plates from underneath got added between them over millions of years.

• India and South Africa are parts of different plates. The plates were sometimes pushed far apart by earthquakes, and soft, solid rock from underneath got added to the edges of the plates.

A vertical cross section of a potted plant would show:

• Diagram A

• Diagram B

• Diagram C

• Diagram D