the best science on the web about
tides

What Causes the Tides?
Image: iStockphoto.com/hidesy

What Causes the Tides?

Stand long enough on an ocean beach, and you’ll see changes in water level. Thanks to gravity from the moon and the sun and Earth’s own motion, you’ll usually witness two high tides and low tides within a lunar day.

Delve a little deeper into how the relative motion of the Earth, moon, and sun push and pull to create the tides.

NOVA/PBS
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High Tide

High Tide

The tide is coming in fast, so play to stay alive above the rising water. More...

Game
Demand Entertainment
Tidal Curiosities

Tidal Curiosities

Although it’s possible to predict high and low tides accurately in some places, our planet also experiences many tidal irregularities. Get the answers to 4 curious questions about tides. More...

Article
NOVA/PBS
Galileo’s Big Mistake

Galileo’s Big Mistake

Even Galileo, the brilliant 17th-century scientist, got it wrong…when it came to his explanation for the tides. Explore how even this mistake reveals his strengths as a great thinker. More...

Profile
NOVA/PBS
How Do Tides Work?

How Do Tides Work?

In this investigation, you’ll examine tide images, charts, patterns, and animations to make a connection between tides and phases of the moon. More...

Interactive
McDougal Littell
Ins and Outs: Michael Marten Photographs the Difference the Tide Makes

Ins and Outs: Michael Marten Photographs the Difference the Tide Makes

Photographs illustrate the dramatic differences between high and low tides. Check your local tide chart before you head for the beach. More...

Images
The Guardian
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Predicting the Tides

Predicting the Tides

Ahoy, Captain! Make sure you know the factors affecting the tides to avoid a costly consequence. You don’t want to crash your cargo ship into a bridge. More...

Interactive
Monterey Institute
Tidal Energy

Tidal Energy

Powered by the nature, tidal energy certainly is renewable. Discover the developing technology that aims to convert tidal energy into electricity. More...

Article
National Geographic
Tidal Resonance

Tidal Resonance

You have to be careful where you park your boat in Canada’s Bay of Fundy. There tides rise and fall almost 60 feet, the highest in the world. Find out what causes this phenomenon, known as tidal resonance. More...

Video
History Channel
Tireless Tides: Extracting Energy from Ocean Tides

Tireless Tides: Extracting Energy from Ocean Tides

Harnessing the power of tides is still in its infancy. Build a model of a tidal barrage (a dam-like structure) to investigate how emptying water through tunnels of different sizes affects energy production. More...

Activity
Science Buddies

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