1. Tides
The ____________ short term changes in the ___________ (rise or fall) of the ocean surface at a particular place

2. Tides Caused by a combination of
__________ between the __________, __________ and __________
__________ force of the _________ and the _________
Moon’s influence 2x’s the sun’s (it is closer to Earth)
the motion of __________

3. Tides The __________ of all __________
Wavelength = ½ Earth’s __________
They are always in __________ water
They are the __________
_________ is proportional to __________
Tides move quickly
~1600 kilometers per hour (1000 mph)

4. Tides Also affected by: 1. ______ and ______ of the ocean floor
2. __________ (greater pull at equator)
3. __________ of water

5. What Causes Tides?
Tides are caused by the ____________________of Earth, the Moon, and the __________.
_____________is the reason for tides.
Gravity is the ____________ exerted by an object that ____________other objects toward it.

6. Moon’s Gravity and Tides
The Moon’s __________affects the __________on Earth’s surface.
Since the Moon is __________to the Earth, it has a __________gravitational pull on it (closer objects have stronger gravitational pull).

7. Moon’s Gravity – Tidal Bulges
The Moon pulls on the water on the side __________to it more __________than it pulls on the __________of the Earth.
This __________creates a bulge of water, called a _____ __________, on the side of Earth __________ the the Moon.

8. Moon’s Gravity – Tidal Bulges
The water on the side of Earth facing __________from the Moon has a __________strong pull.
This water is “__________ __________” and forms a __________bulge.
As Earth __________, different places on the planet’s surface through the areas of __________bulges and have the change in water levels.

9. Tidal Bulges – High Tide
In places where there are tidal bulges, ________ ___________is occurring along the coastlines.
Tidal Bulges – Low Tide
In places __________ the bulges, ______tide is occurring

10. Tides occur when Earth __________beneath the bulge
A tidal day is _____hours _____minutes long because the moon rises _____minutes later each day

11. Earth-Moon System
The moon’s __________ attracts the __________ toward it
The Earth-Moon system __________ once a month (27.3 days) around the system’s center of mass

12. Tides occur when __________ __________ beneath the bulge
A tidal _____ is 24 hours 50 minutes long because the moon rises 50 minutes __________ each day

13. Earth’s rotation = _____ hours (one day)
Moon’s rotation = 24 hours and 50 minutes (_________ day)
Tides occur 50 minutes later every day because of the __________ __________ difference.

14. Variations in Tides
The moon can also move ______ degrees above or below the ________ each month
Tidal bulges are offset relative to this change

15. TIDAL RANGE
Tidal range is the __________between ________ and ________ tide.

16. Sun-Earth-Moon System
Ocean responds to __________ and __________ forces of the _______ too

17. Sun’s Gravity and Tides
The Sun is so __________that its __________also affects tides.
At times, the __________and __________pull together on Earth’s waters in the __________direction.
At other times they pull in __________directions.

18. __________ Tides
When the sun, Earth and moon are __________, __________ and _________ tides are additive
Results in __________ high tides and __________ low tides
Occur at two week intervals during _____ moons and _____ moons

19. _______ Tides
When the sun, Earth and moon are at ______ __________, the __________ tide will reduce the _________ tide
Results in __________ high tides and __________ low tides
Occur at two week intervals, arriving one week after the spring tide (during _____ quarter and _____ quarter moons)

20. Tides are __________ in North America in the __________because the Earth is slightly ________ to the Sun in winter.

21. Tides are also __________ at times during the month when the moon and earth are __________ together.

22. Daily Tide Cycle
Most seashores have _____tides every day – _____high tides and _____low tides.
A __________of from low to high tide or vice versa takes about _____hours and ______minutes.
Changes in tides can be drastic (can notice) or or less dramatic (can’t notice).

23. Monthly Tide Cycle
Changes in the __________of Earth, the Moon, and Sun affect the __________of tides during a month.

25. ______________ is how often tides occur
______________ is how often tides occur. There are some exceptions but basically there are 3 types:
__________ = 2 equal high and low tides per day
each 6 hours - 12 ½ minutes apart
ex: east coast of U.S.
2. __________ = 1 high and 1 low tide per day
each 12 hours - 25 minutes apart
ex: Gulf of Mexico, S.E. Asia
3. __________ = 2 high tides and 2 low tides of unequal range
each 6 hours - 12 ½ minutes apart
ex: west coast of U.S.

26. Importance of Tides Greatly influences __________ marine life
Different organisms have adapted to areas within the __________ zone
______ use the tides to exit and enter port
Tidal power is the ______ ______ ______ _______ that has been __________ used on a large scale