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Moon Tides: How the Moon Affects Ocean Tides
Discusses the different kinds of tides, high and low tides, lunar tide facts, questions people have asked about tides, and causes of tides.
Harvard University
Harvard University: Eyes on the Sky, Feet on the Ground: The Earth's Moon
In this online textbook, students explore the phases of the moon, the moon's orbit, the origin of the moon, and the tides. Includes numerous inquiry-based activities.