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Speaker 1: brain Stuff from how Stuff works dot com where smart happens. Hi,
Speaker 1: I'm Marshall Brain with today's question, what causes high tides
Speaker 1: and low tides? And why are there two tides every day?
Speaker 1: Think about the Moon. It's close enough and big enough
Speaker 1: that it affects the oceans on Earth. You can imagine
Speaker 1: that wherever the Moon is in its rotation, the water
Speaker 1: is deeper at that point on Earth. The Moon's gravitational
Speaker 1: force pulls on water in the oceans, so that there's
Speaker 1: a bulge of water underneath the Moon. But there are
Speaker 1: actually bulges in the ocean on both sides of the planet.
Speaker 1: The bulge on the side of the Earth opposite the
Speaker 1: Moon is caused by the Moon pulling the Earth away
Speaker 1: from the water on that side. If you're on the
Speaker 1: coast and the moon is directly overhead, you should experience
Speaker 1: high tide. If the moon is directly overhead. On the
Speaker 1: opposite side of the planet, you also experience a high tide.
Speaker 1: Between these high tides are the low tides. During the day,
Speaker 1: the Earth rotates a hundred eighty degrees in twelve hours.
Speaker 1: The moon, meanwhile, rotates six degrees around the Earth in
Speaker 1: twelve hours. The twin bulges and the moon's rotation mean
Speaker 1: that any given coastal city experiences a high tide every
Speaker 1: twelve hours and twenty five minutes or so. For more
Speaker 1: on this and thousands of other topics, is it how
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