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TIDES Purpose: Explain tides and the relationship with the Earth, Sun and Moon

Learn about the relationship between tides, the Earth, Sun, and Moon, different types of tides, and the hazards associated with them. Explore tidal terms, such as tidal range, spring tides, neap tides, and storm surge. Understand the daily movement of ocean water and how tides are caused by the gravitational attraction of the Moon and the Earth's rotation. Discover the characteristics of spring tides and neap tides and the impact of tidal range. Lastly, learn about the Bay of Fundy in Nova Scotia, known for its tidal bores and the risks of storm surges during hurricanes and winter storms.

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TIDES Purpose: Explain tides and the relationship with the Earth, Sun and Moon

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  1. TIDES • Purpose: • Explain tides and the relationship with the Earth, Sun and Moon • Classify different types of tides • Identify hazards associated with tides

  2. Tidal Terms • Tides • Tidal range • Spring tides • Neap tides • Storm surge

  3. Ocean Tides • The daily movement of ocean water that changes the level of the ocean’s surface

  4. Tides are caused by • 1.The gravitational attraction of the moon • 2. “centrifugal force” as Earth and the moon orbit around a common center of balance

  5. High Tides are bulges of ocean water that occur on the side of the Earth facing the moon and on the side opposite

  6. Low Tides are the areas between the bulges. Tides change as the Earth rotates between the bulges

  7. Tides occur 50 minutes later each day. • Since the moon moves along in its orbit around the earth each day, the earth must rotate an additional 50 minutes to catch up.

  8. Spring Tides • Have a very large tidal range • Occur every 14 days during a full or new moon

  9. Spring Tides Sun Sun • Are caused by the gravitational forces of the sun and moon pulling in the same directions (180 degrees) Moon Moon

  10. Neap Tides • Have small tidal ranges between high and low tides • Occur every 14 days during 1st and 3rd quarter moons

  11. Neap Tides Sun Sun • Are caused by the gravitational forces of the sun and moon pulling at 90 degrees from each other Moon Moon

  12. Tidal Range is the difference in height between the high tide and low tide.

  13. At low tide in the Bay of Fundy, boats can be left setting on the bay bottom.

  14. High tide arrives in 30 minutes in the Bay of Fundy, rising 20-50 feet Tides of Nova Scotia

  15. The Bay of Fundy is in Canada near northeastern USA

  16. "The Bay of Fundy is known for tidal bores. A tidal bore is the “face’ or edge of the incoming tide and travels about 13 mph.

  17. When hurricanes or winter storms arrive during high tide, greater damage occurs.

  18. Storm surges result when strong winds pile water along the shoreline.

  19. Storm surges may raise sea level up to 18 feet above normal.

  20. During Hurricane Andrew, an ocean-going tugboat was left high and dry by storm surge.

  21. Along the Florida Keys, houses are built on stilts as a protection from storm surges.

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