Tides: High or Low - What Causes Tides? Study Jams Video What Are Tides? Tides are the daily rise and fall of
Earths waters on its coastlines. As the tide comes in, the level of water on the beach rises, and as the tide goes out, the level of water on the beach goes down. Tides occur in all bodies of water, but they are most noticeable in the ocean and
large lakes. High Tides High tides are when the water reaches its highest point. Low Tides
Low tides are when the water reaches its lowest point. What Causes Tides? Tides are caused by the interaction of Earth, the Moon, and the Sun.
Gravity is the reason for tides. Gravity is the force exerted by an object that pulls other objects toward it. Moons Gravity and Tides
The Moons gravity affects the water on Earths surface. Since the Moon is close to the Earth, it has a strong gravitational pull on it (closer objects have stronger gravitational pull). Moons Gravity Tidal Bulges
The Moon pulls on the water on the side nearest to it more strongly than it pulls on the center of the Earth. This pull creates a bulge of water, called a tide bulge, on the side of Earth
facing the the Moon. Moons Gravity Tidal Bulges The water on the side of Earth facing away from the Moon has a less strong pull. This water is left behind and forms a second bulge.
As Earth rotates, different places on the planets surface pass through the areas of the tidal bulges and have the change in water levels.
Tidal Bulges High Tide In places where there are tidal bulges, high tide is occurring along the coastlines. High Tide High Tide
Tidal Bulges Low Tide In places between the bulges, low tide is occurring. LOW TIDE LOW TIDE
Suns Gravity and Tides The Sun is so large that its gravity also affects tides. At times, the Sun and Moon pull together on Earths waters in the same direction. At other times they
pull in different directions. Daily Tide Cycle Most seashores have four tides every day two high tides and two low tides. A change of from low to high tide or vice versa takes about 6
hours and 12 minutes. Changes in tides can be drastic (can notice) or or less dramatic (cant notice). Monthly Tide Cycle Changes in the positions of Earth, the
Moon, and Sun affect the height of tides during a month. Spring Tides Spring tides occur 2 times a month, during a full and new moon when the Earth, Sun, and Moon are lined
up. Spring tides are higher and lower than normal tides. strong tides Neap Tides Neap tides occur in between spring
tides, at the first and third quarters of the Moon when the Sun and Moon pull at right angles to each other. Neap tides are not as high or low as normal tides. weak tides
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