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It happens in most coastal areas of the Earth (not all) and is due to the differing force of gravity at different distances.

The Earth is a 'rigid' body moving in free-fall in its orbit, with the Sun's gravity acting in effect at its centre. The ocean experiences a greater force where the Sun is overhead (because it's closer), and a lesser force at the opposite point (because it's further away). Where the Sun is overhead the net force is towards the Sun, and at the opposite point it is away from the Sun. So there are two areas of deeper water per 24 hours.

In reality the movement of the oceans is complicated by the presence of land-masses, so the actual movement is very complex. It is also made more complex by the Moon's gravity, but the principle is the same.

If the Earth were a long distance from the Sun there would be a smaller difference between the forces on opposite sides of the Earth and the tidal effect would be less.

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10y ago
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10y ago

every night the god kathulu goes to his underwater lair to keep his trapped alien souls in place but to do so he must lower the oceans level to keep the aliens from escaping if he lets them catch to much air they will return to there original power and will escape if this was to happen then they would over throw him he could not let this happen so he had to freeze them then throw them to the bottom of the ocean he is an evil yet smart man he knows that the power they would gain from there freedom would result in the utmost demise of the earth after his conquest however he became a leader in modern medicine he developed a medicine that would cause the aliens to not want to escape and it also has a minty after taste i know this because i am this monster that trapped these souls i need to let people know my story spread the word yo.

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12y ago

because of the differences in how much the moon pulls on the different parts of earth.

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12y ago

It's controlled by the moon's magnetic pull.

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14y ago

Because there is a sun rise and a sun set

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9y ago

hjlk/,d,f

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Q: Why do you have two high tides per day?
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