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Do Now: Read the Tides article and answer the 2
questions
Tim and Moby explain
“Earth’s Tides”
What causes Tides?• The force of gravity pulls the _________ and ________
toward each other.
• Tides occur because of differences in how much the
moon pulls on different parts of ______________.
• As Earth __________, the gravity pulls water toward the
point on Earth’s surface ___________ to the moon.
Earth moon
Earthrotates
closest
High Tides• Closest to the Moon, the ________ pulls on water at
Earth’s surface more strongly than on Earth as a whole.
This creates high tide.
• Farthest away from the Moon, ____________ is pulled
on by gravity _________ strongly than the __________
at that point. Earth is pulled __________ from this point,
leaving the water behind. This creates another high tide.
gravity
waterless Earth as a whole
strongly
Low Tides
• Low tides occur between the ________tides..
• Every location on Earth goes through _____ high tides and ______ low tides in a 25 hour cycle.
high
twotwo
Bay of Fundy
Bay of Fundy Tides Explained
30 Second Time Lapse Bay of Fundy
Label the four positions as high tide or low tide
EARTH
High Tide
Low Tide
High Tide
Low Tide
Spring Tides• The sun’s gravity also pulls on Earth’s
waters.
• Twice a month, during the phases of ____ and ____, the Sun, Earth, and moon are
nearly in a line. The combined forces produce a tide with the _______ difference between high and low tides.
new
full
greatest
Neap Tides
• Twice a month, during the ________ and _______ phases, the line between Earth and the ______ is at a right angle to the line between Earth and the _______. This produces a tide with the ______ difference between low and high tide.
first
third
moon
Sun
least
Tide Chart
• How much time is there between the two high tides every day?
• How much time is there between the two low tides every day?
About 12 hours
About 12 hours
www.weather.com
The End
