The tidal force causes Earth—and its water—to bulge out on the side closest to the moon and the side farthest from the moon. These bulges of water are high tides. High tide left and low tide right in the Bay of Fundy in Canada. Image credit: Wikimedia Commons, Tttrung. Photo by Samuel Wantman. As the Earth rotates, your region of Earth passes through both of these bulges each day.
When you're in one of the bulges, you experience a high tide. When you're not in one of the bulges, you experience a low tide. This cycle of two high tides and two low tides occurs most days on most of the coastlines of the world. This animation shows the tidal force in a view of Earth from the North Pole. As regions of Earth pass through the bulges, they can experiences a high tide. Tides are really all about gravity, and when we're talking about the daily tides, it's the moon's gravity that's causing them.
As Earth rotates, the moon's gravity pulls on different parts of our planet. The moon's gravity even pulls on the land, but not enough for anyone to tell unless they use special, really precise instruments.
When the moon's gravity pulls on the water in the oceans, however, someone's bound to notice. Water has a much easier time moving around, and the water wants to bulge in the direction of the moon. This is called the tidal force. Because of the tidal force, the water on the side of the moon always wants to bulge out toward the moon.
This bulge is what we call a high tide. As your part of the Earth rotates into this bulge of water, you might experience a high tide. An illustration of the tidal force, viewed from Earth's North Pole.
Looking for a specific ingredient? To get a more comprehensive look at all the Tide detergent ingredients, check out our A to Z ingredient list. The following trio of cleaning ingredients is the first line of defense for fighting tough stains and removing unwanted odors, leaving you with the Tide clean that you know and trust.
Surfactants: These are the core stain removers in Tide detergents. They remove anything greasy from fabrics, and they work well on stains and food residues. Enzymes: Enzymes are naturally occurring proteins that break down stains into smaller pieces to make them easier to remove. Each enzyme works to break down and remove a specific type of stain, from grass to chocolate pudding to blood. Amazingly, these powerhouse ingredients are sensitive skin-friendly, and, because enzymes are naturally occurring and biodegradable, they are also sustainable.
Builders and chelants: Builders lock up calcium and magnesium to reduce water hardness, allowing surfactants to get on with their job of removing stains. Chelants bind to heavy metal ions in wash water like iron and copper, which may damage fabrics over time. This phenomenon makes the water either go up or down. So how do tides work? Tides are strongly influenced by the gravitational force of the Moon due to its proximity with the Earth.
Its pull exerted on our planet attracts the water toward it. As for the Sun, it attracts the water surface the same way, but slightly less than the Moon does as it is further away. They are not the only ones which affect the ocean and sea levels. Our beautiful planet Earth also plays a role in the tides phenomenon. When you turn, your car is attracted to the road outside, it works the same way with water surface!
A simplified explanation : the tide gets high when the sea or ocean is closer to the Moon as the water is strongly attracted by it. The tide will get low once the water surface is no longer in front of the Moon and attracted by the centrifugal force.
From now on, you will not see the Moon the same way as you used to and you will now look at its position before you decide to swim or surf.
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