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Tides

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					      Sun, Moon, Earth,



How do they work together
  to help life survive?
          Tides
Mont St. Michel, France:
 Mont St. Michel, France:
• High Tide
 Mont St. Michel, France:
• High Tide   Low Tide
Bay of Fundy, Canada:
  Bay of Fundy, Canada:
• High Tide
  Bay of Fundy, Canada:
• High Tide   Low Tide
              Tides:
• The rise and fall of ocean water
  that occurs every 12 hours.
              Tides:
• The rise and fall of ocean water
  that occurs every 12 hours.
• Alternates between high and low
  tides.
              Tides:
• The rise and fall of ocean water
  that occurs every 12 hours.
• Alternates between high and low
  tides.
• Caused by the moon’s gravity
  “pulling” on the Earth and the
  water on the Earth.
High and Low Tides:


              High Tides




  Low Tides
         Spring tides:
• Happen when the sun, moon, and
  Earth are lined up (new moon and
  full moon).
         Spring tides:
• Happen when the sun, moon, and
  Earth are lined up (new moon and
  full moon).
• Greatest difference between high
  and low tides.
Spring Tides:
          Neap tides:
• Happen when the sun / Earth line is
  at right angles with the moon /
  Earth line.
          Neap tides:
• Happen when the sun / Earth line is
  at right angles with the moon /
  Earth line.
• Tides with the least difference
  between high and low tides.
Neap Tides:

				
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posted:12/21/2011
language:English
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