Question

What are
are earthquakes .?
Define focous
and epicenters?​

Answer 1

Earthquake is , any sudden shaking of the ground caused by the passage of seismic waves through Earth's rocks.

The epicenter, epicentre (/ˈɛpɪsɛntər/) or epicentrum in seismology is the point on the Earth's surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates.

Focus is a point where an earthquake or an underground explosion originates