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Speaker 1: and save ten with promo code. Brain Stuff. Welcome to

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Speaker 1: brain Stuff from how Stuff works dot com where smart happens. Hi,

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Speaker 1: I'm Marshall Brain with today's question, what causes high tides

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Speaker 1: and low tides? And why are there two tides every day?

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Speaker 1: Think about the Moon. It's close enough and big enough

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Speaker 1: that it affects the oceans on Earth. You can imagine

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Speaker 1: that wherever the Moon is in its rotation, the water

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Speaker 1: is deeper at that point on Earth. The Moon's gravitational

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Speaker 1: force pulls on water in the oceans, so that there's

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Speaker 1: a bulge of water underneath the Moon. But there are

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Speaker 1: actually bulges in the ocean on both sides of the planet.

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Speaker 1: The bulge on the side of the Earth opposite the

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Speaker 1: Moon is caused by the Moon pulling the Earth away

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Speaker 1: from the water on that side. If you're on the

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Speaker 1: coast and the moon is directly overhead, you should experience

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Speaker 1: high tide. If the moon is directly overhead. On the

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Speaker 1: opposite side of the planet, you also experience a high tide.

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Speaker 1: Between these high tides are the low tides. During the day,

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Speaker 1: the Earth rotates a hundred eighty degrees in twelve hours.

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Speaker 1: The moon, meanwhile, rotates six degrees around the Earth in

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Speaker 1: twelve hours. The twin bulges and the moon's rotation mean

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Speaker 1: that any given coastal city experiences a high tide every

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Speaker 1: twelve hours and twenty five minutes or so. For more

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Speaker 1: on this and thousands of other topics, is it how

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Speaker 1: stuff works dot com. Protect your photos, music and documents

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