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The Tidal Ecosystem

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The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon. ... Christyna Paris Last modified by: Christyna Paris Created Date: – PowerPoint PPT presentation

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Title: The Tidal Ecosystem


1
The Tidal Ecosystem
  1. What causes the oceans to bulge out in the
    direction of the moon?
  2. What would happen to the water on the earth if
    the moon disappeared?
  • WHAT CAUSES THE TIDES?
  • Tides are caused by the gravitational interaction
    between the Earth and the Moon.
  • The gravitational attraction of the moon causes
    the oceans to bulge out in the direction of the
    moon.
  • Another bulge occurs on the opposite side, since
    the Earth is also being pulled toward the moon
    (and away from the water on the far side).
  • Since the earth is rotating while this is
    happening, two tides occur each day. Isaac Newton
    was the first person to explain tides
    scientifically.

2
Tides
  • The sun and the moon move in cycles affecting the
    flow and ebb of the tides.
  • Here in the Pacific, we have two high and low
    tides of unequal heights each day.
  • Between each high and low tide there is a time
    difference of approximately six hours.
  1. How many high tides are there in a day?
  2. What is happening to the water between high tide
    and low tide?

3
Tide Zones
  • Tidepools, which are exposed at low tide, occur
    within a small strip of land known as the
    intertidal zone.
  • Sandwiched between the shore and the ocean,
    tidepools are extraordinary, teeming with
    hundreds of marine organisms.
  • In the picture Notice that some of the sand is
    completely under the waves, some is wet, some is
    drying out, and some is dry.

5. How do you think the tide zones at a beach
can be found? (think about the picture)
4
  1. Which zone is underwater most of the time?
  2. Which one is the driest tide zone?
  3. Are there actual lines that separate the zones on
    the beach?
  4. Are the animals the same in all tide zones?
    (Look at the picture.)
  5. Give two ways that you could tell the tide zones
    apart if you were at the beach.

5
  • 11.
  • Draw this zone diagram (you can leave out the
    organisms. Just draw the rock.) Leave space to
    write things.
  • Label each zone
  • Go back through slides 13-44 of yesterdays
    assignment. Write the name of the organism in
    the appropriate zone or zones.
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