Faulting of rock in Earth 's crust causes earthquakes, and earthquakes and volcanoes are violent proof of Earth's shifting crust. Given these facts, shifting in the Earth's crust are caused by what among the following options:
- Greenhouse gases
 - rock beds
 - friction
 - avalanches
 - fault in rocks
 - no movement in the crust
 - Movement
 - Time and energy


 

     fault in rocks    