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Tides and Water Levels: a NOAA Ocean Service tutorial

NOAA's National Ocean Service tutorial, a lesson a page, in order.

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What Are Tides? Very Long Waves Driven by the Moon and Sun
Version: 2CC0 1.0 — public domain
What Are Tides? Very Long Waves Driven by the Moon and Sun
What Causes Tides?
Version: 1CC0 1.0 — public domain
What Causes Tides?
Gravity, Inertia, and the Two Bulges
Version: 1CC0 1.0 — public domain
Gravity, Inertia, and the Two Bulges
Changing Angles and Changing Tides
Version: 1CC0 1.0 — public domain
Changing Angles and Changing Tides
Frequency of Tides - The Lunar Day
Version: 1CC0 1.0 — public domain
Frequency of Tides - The Lunar Day
Tidal Variations - The Influence of Position and Distance
Version: 1CC0 1.0 — public domain
Tidal Variations - The Influence of Position and Distance
What Affects Tides in Addition to the Sun and Moon?
Version: 1CC0 1.0 — public domain
What Affects Tides in Addition to the Sun and Moon?
The Importance of Monitoring the Tides and Their Currents
Version: 1CC0 1.0 — public domain
The Importance of Monitoring the Tides and Their Currents
How are Tides Measured? - The Old System
Version: 1CC0 1.0 — public domain
How are Tides Measured? - The Old System
How are Tides Measured? - The New System
Version: 1CC0 1.0 — public domain
How are Tides Measured? - The New System

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