Because of the moon's gravitational pull on the Earth and the Earth's rotational force, coastal areas experience two high and two low tides.
Tides are the alternating movement of water along the coast. High tide is when water advances to its farthest extent onto the oceanfront. Low tide is when it recedes to its farthest extent. The side of the Earth closest to the Moon experiences the Moon's strongest gravitational pull, causing sea levels to rise and tides to occur. On the far side of the Moon, the Earth's rotational force is stronger than the Moon's gravitational pull. The sun's gravitational pull also plays a minor role in the formation of tides. Tides move around the earth as bulges in the ocean.
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