revolution - The orbit of one object around another object. Earth=365 days , gravity - The force that pulls you down to Earth , rotation - The spin of an object around its axis , axis - The imaginary line through the poles on which a body rotates on. , intensity - the amount of energy that passes through a square meter of space in one second , solistice - When Earth is tilted all the way toward or away from the Sun. Winter/Summer, equinox - When Earth receives equal amount of day and night hours. Fall/Spring , Equator - imaginary line that separates the northern hemisphere from the southern hemisphere ,

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