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Coriolis Effect
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The coriolis effect is due to the apparent force on
a free-moving item in a system that is rotating. As an
example, if two children sit opposite each other on a 
moving merry-go-round, and one child rolls a ball 
toward the other, to the children, the ball moves
in a straight line. If the process is observed from
above, however, the ball follows a curved course.
he coriolis effect in weather is due to the earth's
spin and causes winds to deflect to the right in the
Northern hemisphere.