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Tides can create a rhythmic high and low twice every day. But in
some locations like San Francisco Bay, the entire bay moves in an out
twice a day because of tidal action in an irregular timetable. Tidal
forces are caused mainly by gravitational attraction of the Moon and
Sun. The entire envelope of water responds to this attraction. However,
tides are not generally "felt" in deep waters, only coastal.
In the Bay of Fundy, in Nova Scotia, Canada, the tides travel along a
narrow inlet, all at once. The energy that this "bore"
brings is enough to create electricity through tidal energy. That is a
lot of moving water .
Alexander the Great, in 325 BC was exploring the Indian Ocean for
Greece. They took shelter in a small cover due to impending storms and
found their boats were caught by the ebb tide and were left high
and dry. When high tides returned, many boats could leave, but others
were badly damaged. They had never seen this strange event before.
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