Tides PowerPoint Notes - Tamalpais Union High School District
Tides PowerPoint Notes
Integrated Science 1 Name: Per.
I. Definition:_________________________________________________________________________________
a. measured relative to points on land
b. highest level = ____________________________
c. lowest level = _____________________________
II. Occurrence: There are __________________________ and _______________________ each ________.
III. Tidal Ranges: the _________________in feet, or meters, between a and the next .
a. Tidal ranges vary due to _________________________and _________________________.
b. EX: _________________: Gulf of Mexico tidal range is __________
_______________ Bay of Funday tidal range is ___________________________
III. Causes of Tides (see graphic pg. 166)
a. Tides are caused by ________________________________ from the ________ and _________.
b. Gravity is a function of __________and ___________
c. The moon, which is much closer to the earth than the sun, exerts a ____________ gravitational force on the oceans.
c. The force of gravity decreases with _____________________, so the moon exerts a stronger gravitational pull on the _____________________________, and a weaker gravitational pull on the ______________________.
d. The oceans near the moon are pulled up towards the moon creating one _______________.
e. On the far side of the planet, the _________________________________________________ resulting in the water on the far side being effectively ________________ in a _________________.
Tidal Cycle
a. The moon revolves around the earth at a rate of ________________(1 revolution/month)
b. The revolution is in the ______________ direction as the earth’s rotation
c. By the time the earth has completed one rotation, the moon has shifted 12 (. So, it takes an extra ______________________ for the moon to be in the same position relative to a point on earth.
d. A tidal cycle is __________________________________________.
The Sun’s Effect on Tides
a. Because of its size, the sun exerts a gravitational force ___________________________ than the moon!
b. BUT, gravitational attraction _________________________ as the ____________ between bodies ______________
c. The sun’s influence on tides is much ________________________ than the influence of the moon
d. The sun’s pull can either _____________________ the moon’s effects or ______________________ them depending on where the moon is in relation to the sun
e. Spring Tides
▪ When the sun, moon and earth are ________________________, the sun’s gravitational pull _____________________ the effects of the moon.
▪ High tides are ________________ and low tides are __________________ (large tidal ranges).
▪ These tides are called _______________________________.
▪ Spring tides occur at the ___________________ and ____________________.
f. Neap Tides
▪ When the sun’s gravitational pull is ________________________to that of the moon, the sun’s pull______________________the effects of the moon
▪ The result is ________________ high tides and ________________ low tides (small tidal ranges)
▪ This occurs when the moon is in its ______________________ or it’s _____________________
▪ These tides are called ________________________________.
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SFB #___
High and low tides are ______ minutes later everyday.
[pic]
[pic]
Spring Tides
Neap Tides
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