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The Tidal Ecosystem

The Tidal Ecosystem. 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.

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The Tidal Ecosystem

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  1. The Tidal Ecosystem 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. • What causes the oceans to bulge out in the direction of the moon? • What would happen to the water on the earth if the moon disappeared?

  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. • How many high tides are there in a day? • 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. Which zone is underwater most of the time? • Which one is the driest tide zone? • Are there actual lines that separate the zones on the beach? • Are the animals the same in all tide zones? (Look at the picture.) • 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 yesterday’s assignment. Write the name of the organism in the appropriate zone or zones.

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