an earthquake is a form of:

Earthquake



noun
1.
(a violent natural movement of a part of Earth's crust, caused by underground shifting of rock) រញ្ជួយផែនដី
2.
(បច្ចេកទេស) ការរញ្ជួយដី
ENGLISH MEANING
noun
1.
A shaking, trembling, or concussion of the earth, due to subterranean causes, often accompanied by a rumbling noise. The wave of shock sometimes traverses half a hemisphere, destroying cities and many thousand lives; -- called also earthdin, earthquave, and earthshock.
adjective
1.
Like, or characteristic of, an earthquake; loud; starling.