Solar System . Volcanoes 101 . Site map . A fracture in rock that separates it into two sections that have moved relative to each other. A large, splattering meteor that creates a flash brighter than Venus.
Foreshocks often occur in clusters moment or weeks before the main quake.
A rotating, cone-shaped column of air extending down from the base of a thunderstorm. If it reaches the ground it becomes a tornado . E-mail us with general site comments or suggestions. Newsticker for your site Earth . The Edge .