Tornado
A tornado is a violently rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud.
Aurora
An aurora is a natural light display in the sky (from the Latin word aurora, "sunrise" or the Roman goddess of dawn), especially in the high latitude regions, caused by the collision of solar wind and magnetospheric charged particles with the high altitude atmosphere
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