Tides

The gravitational pull of other bodies also affects Earth. Twice a day, the sea rises up and washes up onto the coast. These daily rises and falls of the sea are the tides. They are caused mostly by the Moon’s gravity and, to a lesser extent, by the Sun’s gravitational pull. The Moon pulls water on Earth toward it, and a big bulge of water forms. As Earth spins, the high water moves around the world, causing one of the day’s tides. A smaller bulge left behind on the opposite side of the world causes the second tide