On the Destination Granville Terre et Mer, you sometimes have to walk a long way before you get to the water’s edge… Then, about six hours later, the sea is all the way up the beach. This back and forth is the sea. It’s the Moon that causes the tides by drawing the oceans towards it like a magnet. The Earth is constantly spinning on itself, and the Moon revolves around the Earth. This creates more or less regular cycles that generate shifts in tide times every day.
When the moon is over an ocean, it attracts it and this creates a kind of “hump”. Thus, on either side of this hump, depressions are created: this is the low tide. When the moon has passed beyond the ocean, the hump relaxes and thus extends over the coastlines: this is the high tide.