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The Earth is a spinning globe where a point at the equator is travelling at around 1100 km/hour, but a point at the poles is not moved by the rotation. This fact means that projectiles moving across the Earth's surface are subject to Coriolis forces that cause apparent deflection of the motion.
The following diagram illustrates the effect of Coriolis forces in the Northern and Southern hemispheres. oriolis Forces
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[Create Java applet or Shockwave illustrating Coriolis force to replace above image?]