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Course Outline

Tides are caused by the gravitational interaction of the earth and the moon (and to a much lesser extent, the sun), causing periodic rises and falls of huge volumes of water.

  • Two tides occur each day.
    • Spring tides are strong tides, occurring when the earth, sun, and moon are in a line during a full or new moon.
    • Neap tides are weak tides, occurring during quarter moons when the sun and moon are perpendicular to one another (with respect to the earth).
  • Generally, the best time to dive is at high tide.
  • Unit 2 of 9
  • Topic 3 of 5
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