a jerk
sudden movement
The sudden movement of the earth's crust is called and earthquake
the sudden movement of rocks and soil down a hill is a
A fall is a sudden movement caused primarily by gravity.
Lurch can be a noun and a verb. Noun: A sudden or unsteady movement. Verb: To make a sudden or unsteady movement.
Earth Quake
earthquakes
an earthquake
instant movement
earthquake/fissure
this is a movement that is very fast and sudden
The sudden movement in rock mass causes earthquakes. This is when the rock mass comes together and collapses.