Question

what evidence indicates that an area of the crust is unstable?

Answer 1

Answer:

These geodynamic computer models show that the base of a magmatically over thickened and magnesium-rich crust would have been gravitationally unstable at mantle temperatures greater than 1,500 to 1,550 degrees Celsius and this would have caused it to sink in a process called 'delamination'.

Answer 2

Answer:

This crust of earth included the many pieces which we known as the tactonic plates they are the moving plates these plate can slide past each other. As the result of there movement of plates the huge energy can be released result in the earthquakes which can be really disastrous.