Understanding Tides


Understanding Tides
describes the creation of tides, the roles of the moon and the sun in producing tides, the effects of elliptical orbits, the interactions among astronomical movements, and types of tides. The author, a high school teacher, also looks at phenomena such as seiches and tidal currents that are associated with tides.

Beach Balls


Fact sheet that addresses the following questions: Where can you find beach balls? How are beach balls made? Are any kind of beach balls produced by whales?

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