They're called 'fault lines' or 'plate boundaries'.
Cracks in the Earth's crust are called faults. These fractures occur when the Earth's lithosphere is subjected to stress, causing rocks to break and slide along the fault line. Faults can vary in size and orientation, and the movement along them can lead to earthquakes.
fulat
Movement of rocks along large cracks in the Earth's crust.
earthquakes
This is known as a fault. A fault is a fracture in the Earth's crust along which movement has occurred. Movement along faults can result in earthquakes.
The term is 'earthquake'.
Tectonic plates.
The sudden movement could result in an earthquake.
the movement of earths plates or crust
Trenches if they are in zones of subduction. Falt lines are in areas of shifting plates (rubbing against or parallel)
A Fault??
Faults.