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Bad Astronomy/phil Plait: Tides and Why Our Days Are Getting Longer

For Students 9th - 10th
Why does the Moon always shows the same face to the Earth? Why is the Moon's rotation period the same as the length of time it takes to orbit the Earth? Why are there two tides a day? These questions and more are answered here.
Website
Enchanted Learning

Enchanted Learning: Earth's Oceans Tides

For Students 9th - 10th
This site explains what tides are and the difference between Proxigean Spring Tides, spring tides, and neap tides, and how these are formed. Graphic illustrations are provided.
Primary
MadSci Network

Mad Scientist: Why High Tide Away From the Moon or Sun?

For Students 9th - 10th
An excellent and thorough answer to the often asked question about high tide "bulges" on the side of Earth facing away from the Moon or Sun.
Graphic
Curated OER

Eyes on the Sky, Feet on the Ground: The Earth's Moon

For Students 3rd - 8th
In this online textbook produced by the Smithsonian, students explore the phases of the moon, the moon's orbit, the origin of the moon, and the tides. Includes numerous inquiry-based activities.

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