Multiple choice

The lithosphere is carried on a softer, but still firm, layer of rock called the

  1. geosphere

  2. core

  3. crust

  4. asthenosphere

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The asthenosphere is a semi-fluid, ductile layer of the upper mantle located below the lithosphere. The lithospheric plates move or 'float' on top of this plastic-like layer.