Earthquake Is a sudden motion or trembling in the Earth.
The motion is caused by the quick release of slowly accumulated energy in the form of seismic waves . Most earthquakes are produced along faults , tectonic plate boundaries, or along the mid-oceanic ridges . Earthquake Focus Point of stress release in an earthquake . Earth Revolution Refers to the orbit of the Earth around the sun . Further, the Earth's orbit around the sun is not circular, but elliptical .