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What causes the tides?

cause marée, causes tides

Tides are caused by the combined effect of the gravitational forces of the moon and the sun. 70.8% of the surface of the planet is occupied by the oceans. If the earth were a stationary and isolated planet, then the surface of the oceans would take on the appearance of a perfect sphere. This film of water deforms under the joint effect of the sun and the moon.

The tide is the rising and falling movement of the waters of the seas and oceans.

These movements are called “reflux” or “ebb”.

At the new moon, the tides are strongest. These are spring tides.

During the first and last quarter moons, we find the lowest tides or low-water tides.

During a full moon, the tides are at their strongest again.

Here are some notable tides: in Ungava Bay and the Bay of Fundy, there is a tidal range between 16 and 20 meters; in the Bristol Channel, the tidal range is 15 meters; and in the bay of Mont-St-Michel, the tidal range is 14 meters.

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