All clouds are not created equal. So back up your photos, documents and music with Mosey by E m C, the most trusted name in cloud backup, get it today at Mosey dot com. That's m o z y dot com and save ten with promo code. Brain Stuff. Welcome to brain Stuff from how Stuff works dot com where smart happens. Hi, I'm Marshall Brain with today's question, what causes high tides and low tides? And why are there two tides every day? Think about the Moon. It's close enough and big enough
that it affects the oceans on Earth. You can imagine that wherever the Moon is in its rotation, the water is deeper at that point on Earth. The Moon's gravitational force pulls on water in the oceans, so that there's a bulge of water underneath the Moon. But there are actually bulges in the ocean on both sides of the planet. The bulge on the side of the Earth opposite the Moon is caused by the Moon pulling the Earth away
from the water on that side. If you're on the coast and the moon is directly overhead, you should experience high tide. If the moon is directly overhead. On the opposite side of the planet, you also experience a high tide. Between these high tides are the low tides. During the day, the Earth rotates a hundred eighty degrees in twelve hours. The moon, meanwhile, rotates six degrees around the Earth in
twelve hours. The twin bulges and the moon's rotation mean that any given coastal city experiences a high tide every twelve hours and twenty five minutes or so. For more on this and thousands of other topics, is it how stuff works dot com. Protect your photos, music and documents and access them anywhere with Mosey by e m C, the most trusted name and cloud backup and now save ten percent with promo code brain Stuff at mosey dot com. Get started today at m o z y dot com.