Earthquake, seismometer, tremor, Richter scale, quake, temblor 2

Earthquake, seismometer, tremor, Richter scale, quake, temblor, rock, plate, focus, epicenter, tsunami, , seismograph, seismogram, amplitude, magnitude, scale, safeguard, precaution, open space, building

An earthquake is the vibration felt on the surface of the Earth because of movement of rocks underground. Seismometer measures power of a quake.

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