Question

Earth's mantle is a layer beneath the crust and has distinctive characteristics. Select the statements that are true about the Earth's mantle

1. It is composed of solid rock
2. The asthenosphere, a part of the mantle, exhibits semi-fluid behavior.
3. The mantle extends all the way to the Earth's center
4. The mantle is responsible for generating Earth's magnetic field.

• A. ii, iii
• B. i, ii, iii
• C. i, iii
• D. All

Answer 1

Answer:

B. i, ii, iii

The Mantle

• It is one of the Earth's major layers, situated beneath the crust and above the core.
• It plays a crucial role in shaping the planet's geology and geological processes.s mantle:

Composition:

• The mantle is primarily composed of solid rock.
• While it is mostly solid, it can behave in a semi-fluid manner over long periods of time due to the high temperatures and pressures deep within the Earth.

Depth:

• Extending from the base of the Earth's crust down to approximately 2,900 kilometers (1,800 miles) toward the Earth's center, the mantle makes up a significant portion of the Earth's interior.

Asthenosphere:

• Within the mantle, there is a layer known as the asthenosphere.
• This region, located just below the lithosphere (the rigid outer shell of the Earth), exhibits semi-fluid behavior.
• It's in the asthenosphere where convection currents drive plate tectonics, causing the Earth's lithospheric plates to move.

Earth's magnetic field

• The mantle does not generate Earth's magnetic field.
• Earth's magnetic field is primarily generated by the movement of molten iron and nickel in the outer core.
• This movement of material in the outer core, driven by heat and convection, creates a geodynamo effect that generates the magnetic field.