12/11/2011
Tides
The Moon
• Caused by the gravitational pull of the
moon (and the sun) on the earth’s
ocean
• First explained by Isaac Newton
• Slows the rotation of the earth
Movements of the moon
Tides
Low tide
High tide
Tidal Waves
• Tidal Bore – Tidal Waves that go up a
river
Spring tide
Highest High tide and Lowest Low tide
combined gravitational effect of the sun and the moon.
Occurs at new or full moon
– Rafting on tidal bore
http://tidalborerafting.webs.com/
– Black Dragon Surfing
http://www.youtube.com/watch?v=rQQUto
uNMjU
OR
Neap tide
Lowest High tide and highest low tide.
Mostly gravitational effect of the moon.
Occurs at first or last quarter moon
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