Question

"The earth crust is unstable".explain its two effects on the earth surfaces

Answer 1

The earth crust is unstable because of exogenic force.

Answer 2

earth's crust is unstable because of the following reasons:
1)the plates below the crust when clashes each other causes tsunami and earthquakes
2) volacnic eruptions occur due to the hole in the earth's crust that links it with the core of the earth
3) hot springs are present mostly in soft lands