F

Fahrenheit temperature scale Fault: A fracture in rock that separates it into two sections that have moved relative to each other. More. Fireball: A large, splattering meteor that creates a flash brighter than Venus. More. Flight: how planes fly **includes animations Focus: The place under the surface where an earthquake's energy originates. Foreshock: A tiny earthquake that precedes a larger one with roughly the same focus (the point below the epicenter where the energy originates). Foreshocks often occur in clusters moment or weeks before the main quake. Freezing rain: Supercooled water drops that freeze when they hit the ground or other surface. Fronts (weather): cold/warm **includes animations Frost: The covering of ice that is formed on exposed surfaces whose temperature falls below freezing. Fujita Scale Fujiwhara effect: An interaction where tropical cyclones near one another begin to rotate about a common midpoint. Funnel cloud: A rotating, cone-shaped column of air extending down from the base of a thunderstorm. If it reaches the ground it becomes a tornado.

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