Question

the crust of the earth is neither stable nor permanent.give reason

Answer 1

IU is neither stable nor permanent as the earth's crust floats on liquid lava which keeps moving and the crust with it

Answer 2

Magma below the crust still retains most of the heat left over from the formation of the earth. It is semi-fluid rock, constantly flowing in hot convection currents that rise and fall like that stuff in a lava lamp.

This constant movement below the surface is always shifting the crust and moving it in one direction or another, resulting in tectonic plate movement, earthquakes, and volcanic activity.