Question

The lithosphere is a rigid layer made of Earth's entire crust and the very top part of Earth's mantle. This rigid layer is divided into several large pieces, or plates. The lithospheric plates float on top of the _______, which is a weak part of the mantle that flows slowly.
A.
outer core
B.
inner core
C.
asthenosphere
D.
hydrosphere

Answer 1

C. asthenosphere

The asthenosphere is the weak, ductile part of the upper mantle that flows slowly, allowing the rigid lithospheric plates to move.