One effect of Earth's rotation is the creation of the Coriolis effect, which causes moving objects (such as wind, ocean currents, and the trajectories of projectiles) to be deflected to one side as they travel along the planet's surface. This results in the formation of rotating weather systems and ocean currents, as well as the characteristic eastward flow of the jet stream. The Coriolis effect is stronger at the poles and weaker at the equator, and it affects the direction of movement of many large-scale natural systems on Earth.