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What causes high tide and low tide? Why are there two tides each day? In this diagram, you can see that the moon's gravitational force pulls on water in the oceans so that there are bulges in the ocean on both sides of the planet. The moon pulls water toward it, and this causes the bulge toward the moon. 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. Up Next. If you are on the coast and the moon is directly overhead, you should experience a high tide.
A tide is the periodic rising and falling of Earth's ocean surface caused mainly by the gravitational pull of the Moon acting on the oceans. Tides cause changes in the depth of marine and estuarine (river mouth) waters. Tides also make oscillating currents known as tidal streams (~'rip tides'). This means that being able to predict the tide is important for coastal navigation.