2. Tides are the periodic rise and fall of the water level in the oceans and other large bodies of water.

3. Tides are influenced by the gravitational pull of both the Sun and the moon on the waters of Earth’s oceans.

4. time light takes to reach Earth from each
Although the moon is much smaller than the sun, its closeness to the earth results in about twice as much pull force.

5. 221, 567 miles
93,000,000 miles

6. Although the moon is much smaller than the sun, its closeness to the earth results in about twice as much pull force.

7. The moon's gravity pulls the ocean's waters toward the part of the earth it is facing. On the opposite side it is pulling the earth away from the waters.

8. This pulling causes the waters to bulge at these two points
This pulling causes the waters to bulge at these two points. The result is a high tide at the two bulging points and a low tide at the other two points because the water is being redirected.
low tide
high tide
high tide
low tide

9. Each location on the earth passes through these points twice a day, usually experiencing two high and low tides daily.

12. Tidal Range= the difference in levels of ocean water at high tide and low tide.

13. HIGH TIDE VS LOW TIDE

14. HIGH TIDE VS LOW TIDE

15. HIGH TIDE VS LOW TIDE

16. Low Tide at Minas Basin, Nova Scotia

17. High Tide at Minas Basin, Nova Scotia

18. But what happens when we consider the Sun also has a gravitational pull on the Earth?

19. What do you notice?

20. When the sun and moon work together, there are higher high tides and lower low tides, called
SPRING TIDES

21. When the sun and moon work against each other, there are lower high tides and higher low tides, called
NEAP TIDES

22. Spring Tides are the result of the moon and sun working together to exert more pull on the earth's oceans.

23. Spring Tides occur when the earth, sun and moon are all aligned
Spring Tides occur when the earth, sun and moon are all aligned. Spring tides occur during new and full moons.

24. This extra gravity pulling on the same point of the earth causes stronger high and low tides.
These tides are named spring tides not because of the season but because the tides are springing stronger up and down

25. Neap Tides are the result of the moon and sun working against each other’s pull.

26. Neap Tides occur when the earth, sun and moon are in a right angle
Neap Tides occur when the earth, sun and moon are in a right angle. Neap tides occur during quarter moons.

27. moon revolution is backwards, but still a good visual…

29. Spring Tides= largest difference between high and low tide
Spring Tides= largest difference between high and low tide. Neap Tides= smallest difference between high and low tide.

30. Tidal Range

32. Ocean tides follow predictable patterns.

34. Tides Video Clips
“The Moon and Tides” (4:00)