Let`S Talk About The Earths Tides

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  • 1. Let`s Talk About the Earths Tides...
  • 2. Moon Phases...
    Supplied by: http://can-do.com/science/moonphases/Moonphases.gif
  • 3. Refresher Activity...
    • What do we remember about the Phases of the Moon?
    • 4. Fill in the Worksheet – Moon phases – you can discuss the with your neighbours.
    Moving On...
    • Tides – Movie Clip – “The Mysteries of Earths Tides.”
    By:
    http://www.youtube.com/watch?v=aN2RM5wa1ek&feature=related
  • 5. Earth`s Tides...
    What are Tides?
    • Tides are the alternating rise and fall in sea level with and are produced by the gravitational attraction of the moon and the sun.
    • 6. Have a look at the picture below, it is the same Harbour at two different times of the day.
    High Tide Low Tide
    High Tide Low Tide
    Supplied by: http://ibbly.com/img/tides.jpg
  • 7. How does the Phases of the Moon effect the Tides?
    • The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon.
    • 8. Another bulge occurs on the opposite side, since the Earth is also being pulled toward the moon.
    • 9. Ocean levels fluctuate daily as the sun, moon and earth interact.
    • 10. As the moon travels around the earth
    and as they, together, travel around the sun, the combined gravitational forces cause the world's oceans to rise and fall.
    • Since the earth is rotating while this is
    happening, two tides occur each day.
    Supplied by: http://www.dreamstime.com/royalty-free-stock-photography-earth-moon-sun-image4147287
  • 11. Are there names for the Tides?
    • Yes there are, for this lesson we are only going to focus on two:
    • 12. Spring tides
    • 13. Neap tides
    Supplied by: http://www.masters-of-photography.com/T/talbot/talbot_ships_at_low_tide_full.html
  • 14. Spring Tide...
    What is a Spring Tide?
    • Spring tides are especially strong tides (they do not have anything
    to do with the season Spring).
    • They occur when the Earth, the Sun and the Moon are in a line.
    • 15. The gravitational forces of the Moon and the Sun both contribute to the tides.
    • 16. Spring tides occur during the full moon and the new moon.
    • 17. Activity: Tides Worksheet – Spring Tide
    Supplied by;:http://www.happisburgh.org.uk/gallery/ronjames/Spring_Tide_Looking_SE.jpg
  • 18. Spring Tide...
    Supplied by: http://www.physicalgeography.net/fundamentals/8r.html
  • 19. Neap Tide...
    What is a Neap Tide?
    • Neap tides are especially weak tides.
    • 20. They occur when the gravitational forces of the Moon and the Sun are perpendicular to one another (with respect to the Earth).
    • 21. Neap tides occur during
    quarter moons.
    • Activity:
    Tides Worksheet – Neap tide
    Supplied by: http://www.flickr.com/photos/katebodger/3254443305/
  • 22. Neap Tide...
    Supplied by; http://www.physicalgeography.net/fundamentals/8r.html
  • 23. Conclusion...
    Supplied by: http://www.redfishpro.org/images/SpringTides.gif
  • 24. Group Activity...
    Mini Tide Experts
    • Class divides into four groups
    • 25. Each group will be given a different Moon Phase
    • 26. Each phase refers to a different Earth Tide
    Objective
    • Design a poster of your moon phase and how it influences Tides on Earth.
    • 27. Short presentation to the class.
    Resources Available
    • Poster/butchers paper
    • 28. Marker pens
    • 29. Worksheet notes – Moon Phases and Tides
  • References:
    • National Oceanic and Atmospheric Administration. (2008). Tides and water levels. Retrieved from: http://oceanservice.noaa.gov/education/kits/tides/welcome.html
    • 30. Climate Science from the Southeast Pacific. (2008). Tides of the ocean. Retrieved from: http://www.windows.ucar.edu/tour/link=/earth/Water/ocean_tides.html&cd=falsel&portal=vocals&edu=mid
    • 31. Ignite Learning. (2009). The Mysteries of Earths Tides. Retrieved from: http://www.youtube.com/watch?v=aN2RM5wa1ek&feature=related