Crust

Question 1

What is the outermost layer of the geosphere called?

Answer 1

crust

Question 2

What is the boundary between the crust and the mantle called?

Answer 2

Mohorovicic discontinuity

Question 3

What layers comprise the lithosphere?

Answer 3

Upper mantle
Crust

Question 4

Which of these is not part of the oceanic crust?

Answer 4

Continental margins

Question 5

Why are continental crusts relatively older than oceanic crusts?

Answer 5

The rock along the trenches are continually recycled through the process of subduction

Question 6

Based on the figure below, which plates do the oldest oceanic rocks divide?

Answer 6

Eurasian plate
African plate

Question 7

You were given mafic rock samples that are rich in iron, magnesium, and calcium. What can you infer about the source of these samples?

Answer 7

They were obtained from the oceanic crust

Question 8

Deformed Precambrian crystalline rocks called shields are usually found in cratons of Earth’s crust. Which of the following types of rocks cover these shields?

Answer 8

sedimentary rocks

Question 9

If I want to find the oldest rocks in Earth, where should I look?

Answer 9

Stable platforms

Question 10

Which of the following statements is correct about Baker and Sofonio’s theory on the formation of Earth’s crust?

Answer 10

Some of the material that settled on early Earth’s surface originated from the steamy atmosphere