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Ocean Motion PowerPoint Presentation
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Ocean Motion - PowerPoint PPT Presentation

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Ocean Motion

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  1. Ocean Motion

  2. currents Ocean currents are movements of ocean water that follow a regular pattern. There are 3 different types of currents:

  3. currents Surface currents are a horizontal movement of ocean water caused by wind and occurs near the ocean’s surface.

  4. currents Surface currents are controlled by 3 factors:

  5. currents Global winds Winds that blow across Earth’s surface Curving of moving objects from a straight line because of Earth’s rotation Coriolis Effect When currents change directions because they bump into the continents. Continental deflections

  6. currents Warm water currents begin near the equator and carry warm water to the rest of the ocean. Cold water currents begin near the poles and carry cold water to the rest of the ocean.

  7. currents The next type of current is…

  8. currents Deep (density) currents are a streamlike movement of ocean water far below the surface.

  9. currents Deep (density) currents are not controlled by the wind like surface currents.

  10. currents Deep (density) currents form where water density increases.

  11. currents Temperature Salinity

  12. currents The last type of current is…

  13. currents Upwelling is the movement of deep, cold, nutrient-rich water to the surface.

  14. currents They bring nutrients to the surface that supports the growth of plankton.

  15. currents El Nino is the periodic change in the location of warm & cool surface waters in the Pacific Ocean

  16. currents By experiencing unusual weather patterns that can cause disasters such as flash floods & mudslides.

  17. WAVES A wave has 4 parts…

  18. WAVES

  19. WAVES Crest waveheight wavelength Trough

  20. WAVES Amplitude is the measure of a wave’s energy. FrequencyThe number of waves that pass a fixed point in a given amount of time.

  21. WAVES Most waves are formed by wind. This causes energy to move through the water.

  22. tides A tide is the daily change in the level of the ocean water.

  23. tides Tides are caused by the gravitational pull of the sun & moon.

  24. tides The moon’s pull is strongest on the part of the Earth directly facing the moon.

  25. tides Tidal range is the difference between levels of ocean water at high tide and low tides. What is the tidal range of an area if the high tide is 20 ft. and the low tide is 15 ft.? 20 -15 5

  26. tides At certain times in the month, there are 2 special types of tides…

  27. tides A spring tide is a tide of increased range that occurs 2 times a month, at new & full moons.

  28. tides MOON EARTH SUN

  29. tides A neap tide is a tide of minimum range that occurs during the 1st & 3rd quarters of the moon.

  30. tides EARTH SUN MOON

  31. tides The Bay of Fundy has the greatest tidal range in the world.