PLATES
When the earth's crust splits apart and a ravine is formed, it is called a rift valley. Rift valleys are created by the stretching and thinning of the Earth's crust, often associated with tectonic plate movements or volcanic activity. Examples of rift valleys include the East African Rift and the Rhine Valley in Europe.
The Earths crust is approximately 650 km deep.
The sudden vibration in the plates inside the crust causes the earths crust to rise & fall.
Rupture or fault.
Rift
mantle
The earth's crust is not stress
half of earths layer
continental crust
crust
The earth's crust is generally solid.
The crust is the thinnest part on the Earth.