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Tides

Tides. Tides. The daily rise and fall of Earth's waters on its coastlines are called tides. When the water reaches its highest point, it is high tide. When the water reaches its lowest point, it is low tide.

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Tides

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  1. Tides

  2. Tides • The daily rise and fall of Earth's waters on its coastlines are called tides. • When the water reaches its highest point, it is high tide. • When the water reaches its lowest point, it is low tide. • Tides occur in all bodies of water, but they are most noticeable in the ocean and large lakes.

  3. What Causes Tides?

  4. What Causes Tides? • Tides are caused by the interaction of earth, the moon, and the sun. • The moon pulls on the water on the side closest to it more strongly than it pulls on the center of the Earth. • This pull creates a bulge of water called a tidal bulge. • As Earth rotates, the planet's surface pass through areas of the tidal bulges and experience changes in water levels.

  5. High Tide Low Tide

  6. The Daily Tide Cycle • High tides occur about 12 hours apart in each location.

  7. The Monthly Tide Cycle • Even though the sun is 150 million kilometers from Earth (93 million miles), it is so massive that its gravity also affects the tides. • The sun pulls the water on Earth's surface toward it. • Changes in the positions of Earth, the moon, and the sun affect the height of the tides during a month.

  8. Spring Tides • Twice a month, at the new moon and the full moon, the sun and moon are lined up. • Their combined gravitational pull produces the greatest range between high and low tide, called a spring tide.

  9. Neap Tides   • In between spring tides, at the first and third quarters of the moon, the sun and moon pull at right angles to each other. • This line-up produces a neap tide, a tide with the least difference between low and high tide.

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