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The Epic Interactive Encyclopedia 1997
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1992-09-03
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401b
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12 lines
A tide is the rise and fall of sea level due
to the gravitational forces of the Moon and
Sun. High tide occurs at an average interval
of 12 hours, 24 minutes, and 30 secs. The
highest or spring tides are at or near new
and full Moon, the lowest or neap tides when
the Moon is in its first or third quarter.
Some seas, such as the Mediterranean, have
very small tides.
Subject by: Vince Pike