Tides are the rise and fall of the levels of the ocean. The rotation of the Earth contributes to the change in ocean levels, as well as the gravitational pull from the Sun and Moon. Tides cycle as the Moon rotates around the Earth and as the position of the Sun changes. Throughout the day the sea level is constantly rising or falling.
High tide is when the sea level is at the highest. Low tide is when the sea level is at the lowest.
High tide is when the sea level is at the highest. Low tide is when the sea level is at the lowest.
While the Sun and the rotation of the Earth both have some tidal impact, the location of the Moon has the biggest affect on the tide. The gravity of the Moon causes a high tide both on the side of the Earth directly below the Moon (sublunar tide) and the opposite side of the Earth (antipodal). Low tides are on the sides of the Earth 90 degrees away from the Moon.
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