1. Tides
Periodic rising and falling of ocean waters caused by the gravitational pull of the sun, moon & Earth.
Also affected by:
Shape and depth of ocean floor
Latitude (greater pull at the equator)
Volume of water

2. Sun, Moon or Earth? Which has the greatest affect on tides?
The Moon!
Even though the sun is larger, the moon is closer so it has more “pull”

3. Spring Tides Tide of max range (high, high tides and low, low tides)
Occur when Earth, sun & moon are aligned
Occur during full and new moons

4. Neap Tides Tide of min range (high and low tides are weak)
Gravitational forces of the moon & sun are at a right angle with the Earth
Occur at quarter moons

5. The Earth and the Moon revolve around each other and rotate on their axes
Earth’s rotation = 24 hours
Moon’s rotation = 24 hours and 50 minutes
Tides occur 50 minutes later every day because of this rotation time difference

6. How Stuff Works: Tides

7. Bay of Fundy
*Video Clip

9. Frequency of Tides Semi-diurnal Mixed Diurnal
2 equal high and low tides per day
East coast of United States
Mixed
2 highs and 2 lows of unequal range
West coast of US & west coast of FL
Diurnal
1 high and 1 low tide per day
Parts of Gulf of Mexico
NOT FLORIDA!

10. Tides

11. Questions for each tide table:
How many high and low tides did this place experience on the first day shown on the chart?
B. What type of tidal pattern does this place have?
C. What are the tidal heights (low & high) on the 1st day listed?
D. Do the tides on the first day listed appear similar to the tides listed on the second day? Yes or No. If no, what could be the cause of the change?

12. Table #1

13. Table #2

14. Table #3

15. Table #4

16. Table #5

18. How do Tides Influence Marine Organisms