Tides PowerPoint Notes
Integrated Science 1
I.
Name:
Per.
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
next
and the
.
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 _________________.
IV.
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 __________________________________________.
High and low tides are ______ minutes later everyday.
V.
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 ____________________.
Spring Tides
Neap Tides
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 ________________________________.