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"Tides" is a generic
term used to define the alternating rise and fall in sea level with
respect to the land, produced by the gravitational attraction of the
moon and the Sun. The most familiar evidence of the tides along our
seashores is the repeated appearance of high and low water -- usually,
BUT NOT ALWAYS-- twice daily. The
image above show several simple scenarios where Earth's oceans are
very deep and cover the entire surface. In this case, the gravitational
pull of the moon and the rotation of Earth combine to produce two bulges:
one on the side close to the moon and the other on the opposite side.
High tide occurs at the bulges. Low tide is 90° away. |
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