Question

1. which layer of the earth is described as having a \plastic\ quality that allows it to flow? asthenosphere mesosphere lithosphere inner core

Explanation:

To solve this, we analyze each option:

• Asthenosphere: Part of the upper mantle, has a plastic (ductile) quality, allowing slow flow (like convection currents for plate tectonics).
• Mesosphere: In the atmosphere (not Earth's interior layers relevant here), so incorrect.
• Lithosphere: Rigid (crust + upper mantle), not plastic/flowing.
• Inner Core: Solid, no flow.

Thus, the Asthenosphere matches the description.

Answer:

A. Asthenosphere