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earthquake

earth·quake [ úrth kwàyk ] (plural earth·quakes)


noun 
Definition:
 
1. shaking of Earth's crust: a violent shaking of the Earth's crust that may cause destruction to buildings and results from the sudden release of tectonic stress along a fault line or from volcanic activity.
Technical name  seism


2. disruptive event: an event that causes an upheaval in society, politics, or somebody's life

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