Answer:
D
Explanation:
Isostasy is the condition of equilibrium that results in the displacement of the mantle by the continental and oceanic crust.
Isostasy is also known as standstill. It is the condition that makes earth's crust and mantle to float dependin on the thickness of the roots.
Plate tectonics will slow and eventually stop.
-86 because it changes to a minus. Negative minus negative means you add them.
