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Tides

Tides. Chapter 13.2 & 19.2 Pages 434-437 & 654. Tides. The rise and fall of Earth’s water on its coastlines. High tide- water is at the highest point. Low tide- water is at the lowest point. Cause of Tides. Caused by the interaction of the Earth, moon and sun.

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Tides

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  1. Tides Chapter 13.2 & 19.2 Pages 434-437 & 654

  2. Tides • The rise and fall of Earth’s water on its coastlines. • High tide- water is at the highest point. • Low tide- water is at the lowest point.

  3. Cause of Tides • Caused by the interaction of the Earth, moon and sun. • Gravity- pulls the moon and Earth (including the water) towards each other.

  4. Cause of Tides • As Earth rotates, different places on the planet pass through the areas of tidal bulges and experience the change of water levels.

  5. Cause of Tides • Two Tidal Bulges form: resulting in two high tides on Earth: • One on the side of the moon- due to the moon’s gravity • One on the opposite side- more complex reason, but the water is left behind • Two low tides occur in the places between the bulges.

  6. Daily Tide Cycle Monthly Tide Cycle • High tides occur about 12 hrs and 25 minutes apart. • Not every place has two regular tides a day. • Depends on the shape of bays, inlets and the ocean floor.

  7. Monthly Tide Cycle • The Sun also impacts tides even though it is 150million km away. • The sun also pulls the water on the Earth’s surface.

  8. Spring Tides • Twice a month- New Moon and Full Moon • Sun and Moon’s gravitational force combine • Results in really high tides and really low tides.

  9. Neap Tides • Twice a month- First and Third Quarter Moon • Sun and Moon pull at right angles to each other. • Results in a tide with little difference between low and high tide. • Even outs the tides.

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