1. Which layer(s) of the Earth’s interior listed below are mostly mafic in compo

Question

1. Which layer(s) of the Earth’s interior listed below are mostly mafic in composition?

a. Continental Crust

b. Oceanic Crust

c. Mantle

d. Core

2. Which layer of the Earth's interior listed below is also the full equivalent of a tectonic plate?

Select one:

a. Outer Core

b. Crust

c. Asthenosphere

d. Mesosphere

e. Lithosphere

3. The Moho Discontinuity represents the boundary between which two layers?

Select one:

a. The lithosphere and asthenosphere

b. The crust and the lithosphere

c. The crust and the mantle

d. The mesosphere and the core

e. The asthenosphere and the core

4. As a whole, the oceanic crust is a lot older than the continental crust.

a. True

b. False

5. The Mesosphere is hotter than the Asthenosphere and as a result flows faster than the Asthenosphere.

a. True

b. False

6. The Asthenosphere is a layer below the Lithosphere that has the physical property of:

a. Brittle solid

b. Ductile solid

c. Liquid

7. Which of the layers below defined by its composition makes up the lithosphere?

a. Mantle and core

b. Crust and uppermost mantle

c. Crust and mantle

d. Crust and core

8. What is the chemical composition of the mantle according to the lecture?

Select one:

a. Felsic

b. Mafic

c. Ultramafic

d. Pure iron and nickel

Explanation / Answer

1. Which layer(s) of the Earth’s interior listed below are mostly mafic in composition?

Ans. c. Mantle

Mantle is the layer within the Earth which is composed of mafic rocks. Or more preciously the composition of the upper mantle is mafic.

2. Which layer of the Earth's interior listed below is also the full equivalent of a tectonic plate?

Ans. e. Lithosphere

Lithosphere is also the full equivalent of a tectonic plate. The alternative name of the tectonic plate is lithospheric plate. Lithospheric plates are floating above the asthonesphere.

3. The Moho Discontinuity represents the boundary between which two layers?

Ans. c. The crust and the mantle.

Moho Discontinuity represents the boundary between the crust and the mantle. The average depth of Moho Discontinuity is 30-40 km.

4. As a whole, the oceanic crust is a lot older than the continental crust.

Ans. False.

Oceanic crust is alwayas younger than the continental crust. Because new crust formed in the oceanic spreading centre.

5. The Mesosphere is hotter than the Asthenosphere and as a result flows faster than the Asthenosphere.

Ans. False.

The temperature of the Mesosphere is greater than the Asthenosphere but due to greater pressure strength of the rock is greater than the Asthenosphere. As a result rock in the Mesosphere flows more slowly than the Asthenosphere.

6. The Asthenosphere is a layer below the Lithosphere that has the physical property of:

Ans. b. Ductile solid.

The ductile solid layer lies below the brittle Lithosphere is Asthonosphere. As a result lithospheric plates floates above the ductile Asthonosphere.

7. Which of the layers below defined by its composition makes up the lithosphere?

Ans. b. Crust and uppermost mantle.

The average depth of Lithospher is 80-100 km. And the composition of the lithosphere is equivalent to Crust and uppermost mantle.

8. What is the chemical composition of the mantle according to the lecture?

Ans. b. Ultramafic.

Mantle is mainly composed of olivine and pyroxene bearing rocks. Both mafic and ultramafic are present within the mantle. But the overall Earths mantle is Ultramafic.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.