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The tidal range is the vertical difference between the high tide and the succeeding low tide. Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth.
Understanding Tides Tides and tidal currents are caused by gravitational forces of the Sun and Moon acting upon the oceans of Earth as it spins. Because of its proximity to the Earth, the Moon exerts roughly twice the tide-raising force of the Sun.