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Q: What is the upper part of the earth's mantle called ?
  • A. Asthenosphere
  • B. Lithosphere
  • C. Stratosphere
  • D. Troposphere
Correct Answer: Option A - Asthenosphere is the part of upper mantle located below the crust of the Earth. The asthenosphere is a mechanically weak layer beneath the lithosphere characterized by low seismic wave velocities and high attenuation. Convention currents generated within the asthenosphere push magma upward through volcanic events and spreading centres to create new crust.
A. Asthenosphere is the part of upper mantle located below the crust of the Earth. The asthenosphere is a mechanically weak layer beneath the lithosphere characterized by low seismic wave velocities and high attenuation. Convention currents generated within the asthenosphere push magma upward through volcanic events and spreading centres to create new crust.

Explanations:

Asthenosphere is the part of upper mantle located below the crust of the Earth. The asthenosphere is a mechanically weak layer beneath the lithosphere characterized by low seismic wave velocities and high attenuation. Convention currents generated within the asthenosphere push magma upward through volcanic events and spreading centres to create new crust.