Avalanche

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Avalanche is a mass of snow that slides down a mountain slope. Most avalanches result from weather conditions that cause snow on a mountain slope to become unstable. Such disturbances as heavy winds, earth tremors, and explosions can send the snow sliding down the mountain. Skiers have started many avalanches.

Silurian Period

Silurian, suh LOOR ee uhn, Period was a time in Earth's history that lasted from around 440 million to 410 million years ago. Geologists first… See more »

Cenozoic Era

Cenozoic see nuh ZOH ihk or sehn uh ZOH ihk, Era, is the most recent era in the geologic time scale of the earth's history. Geologists believe… See more »

Ice age

Ice age is a period in Earth's history when ice sheets cover vast regions of land. Ice ages alternate with interglacial periods, when the ice… See more »

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Avalanche

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