Question

A state of balance thought to exist within the Earth's crust
isostasy
isometric
isotope
isotherm​

Answer 1

I think the answer is isostacy.

Answer 2

Option “A” is correct i.e. isostasy.

• A state of balance thought to exist within the earth’s crust is known as isostasy.

• Isostatic equilibrium or simply isostasy is the state of gravitational equilibrium between earth’s crust.

• The state of balance or compression equilibrium supposed to exist within the Earth's crust, whereby the upper lithosphere drifts on denser magma beneath.

Hope it helped....