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An  earthquake  (also known as a  quake ,  tremor  or  temblor ) is the result of a sudden release of energy in the  Earth's   crust that creates  seismic waves . The  seismicity ,  seismism  or  seismic activity  of an area refers to the frequency, type and size of earthquakes experienced over a period of time. Earthquake in Bangladesh

A email signature is a bit of text (such as your contact information or a favorite quote)  that's automatically inserted at the bottom of every message you send. Here's a sample gmail signature: Sample Email Signature