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The tides change because the gravitational pull from the Moon onto Earth. The Moons gravity pulls the water toward the moon. The Side of Earth facing the moon has a high tides. The Pull of gravity causes Oceans to bulge outward. On the other side of Earth, the Moons pull on solid ground causes the Oceans to bulge there too. The Earth rotates on its axis and so this bulge is constantly changing location. Where the bulge is bigger, its high tide. Where the water doesn't bulge is low tide.

I hope this helps, if there is anything else u want to ask me just let me know. For more information about Tides you could watch a brainpop on brainpop.com.

Further. The Earth's tides are a combination of the gravitation pull due to the Moon and also the Sun. When these add, we have the highest high tides. When these oppose, we have the lowest high tides.

Now, the moon takes roughly 28 days for its orbit of the Earth, and since this is NOT an simple multiple of the 24 hour rotation of the Earth, the tides gradually precess round the Earth - the afternoon High Tide will be roughly one hour later each day.

[Ignoring those folk in N Australia and the English Channel (+ +) where local conditions give several tides per day!]
Because Life can Change

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