The Beaufort Scale relates wind speed with observable effects of wind. It was developed in 1805 by Francis Beaufort.
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EPICENTER
The epicenter is the point on the surface of the Earth that is directly above the focus of an earthquake.
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FAULT LINE
A fault line is the boundary between two tectonic plates.
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PYROCLASTIC FLOW
The pyroclastic flow is the fast moving mass of hot gas, lava, and rock fragments when a volcano erupts.
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RICHTER SCALE
The Richter Scale is a logarithmic scale used to express the magnitude of an earthquake. It ranges from 1 to 10, where 1 can barely be felt, and 10 is near total destruction.