The word “tides” is a term used to define “the alternating rise and fall in sea level with respect to the land, produced by the gravitational attraction of the moon and the sun.” To a smaller extent, tides also occur in large lakes, the atmosphere, and within the solid crust of the earth. Tides are essentially created because the Earth and the moon are attracted to each other, similar to the way magnets work. The moon is constantly trying to pull at anything on the Earth to bring it closer, but the Earth is able to remain stable except for the water. This is because water is always moving and the Earth is unable to control it.
The solid rock of the earth also flexes for the same reasons and in a similar manner to the oceanic tides. Called earth tides, they are typically of amplitudes of a few inches.
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