I

Indian summer: An unseasonably warm period near the middle of autumn, usually following a substantial period of cool weather. Inertia **includes animations Inversion: Cool air near the ground trapped by warm air aloft. Io: One of four Galilean moons of Jupiter. Ion: Atom or molecular fragment with a positive electrical charge due to the loss of one or more electrons. Isobar: A line of equal barometric pressure on a weather map.

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