![]() The closer objects are, the greater the gravitational force is between them. ![]() The major tidal constituent is the moon’s gravitational pull on the Earth. The Earth’s rotation is a tidal constituent. Causes of Tides Forces that contribute to tides are called tidal constituents. Some lakes and rivers can also have tides. When the water falls to its lowest level, it is at low tide. ![]() When the water has risen to its highest level, covering much of the shore, it is at high tide. Along coasts, the water slowly rises up over the shore and then slowly falls back again. The regular rise and fall of the ocean’s waters are known as tides.
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