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water cycle

The Water Cycle
Image: iStockphoto.com/Studio-Annika

The Water Cycle

Always on the move, even when invisible or appearing still, water rises and falls constantly in a process of precipitation, transpiration, evaporation, and condensation.

What comes down must go up, especially warming droplets and cooling vapor. See where you fit into this never-ending water cycle.

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Mars’ Ice Patchy, Water Cycle Quite Active, Study Reveals

Mars’ Ice Patchy, Water Cycle Quite Active, Study Reveals

Research on the underground ice of Mars suggests that the red planet has an active water cycle. Investigate how scientists made this discovery. More...

Article
National Geographic
Warming Is Accelerating Global Water Cycle

Warming Is Accelerating Global Water Cycle

Research points to evidence that global warming has been speeding up the water cycle, bringing on more violent storms. More...

Article
Science News for Students
Components of the Water Cycle

Components of the Water Cycle

Water never fails to circulate around the globe, ascend to the atmosphere, and return. Watch animations that portray the separate components of the water cycle. More...

Video
NASA
A Warmer World Might Not Be a Wetter One

A Warmer World Might Not Be a Wetter One

The water cycle varies from place to place, and many factors affect it. Explore why a warmer climate, which increases evaporation and precipitation, doesn’t necessarily change this cycle. More...

Article
NASA
Build a Model of the Water Cycle

Build a Model of the Water Cycle

The sun is a powerful energy source for those of us on Earth, and that’s true for the water cycle, too. Create a mini-cycle in a bag and observe what happens in a sunny window. More...

Activity
Museum of Science, Boston
How Does Water Form?

How Does Water Form?

You know that the elements hydrogen and oxygen form water, but it takes energy to move the atoms around correctly. Find out what else is necessary to create this crucial compound. More...

Article
Discovery
Raindrop Traveling Through the Water Cycle

Raindrop Traveling Through the Water Cycle

The water cycle is a natural phenomenon, but here you can move one big blue raindrop to follow it through the different processes. More...

Interactive
McDougal Littell
The Hydrologic and Carbon Cycles: Always Recycle!

The Hydrologic and Carbon Cycles: Always Recycle!

To understand the carbon cycle, it helps to understand the water (or hydrologic) cycle. And to understand anything, it helps to have it explained by Hank Green. More...

Video
CrashCourse
The Surfrider Foundation Explains Watersheds 101

The Surfrider Foundation Explains Watersheds 101

From the mountains to the seas, water flows downhill. Watch how the water cycle and watersheds work together to keep the moisture moving. More...

Video
AAAS
The Water Cycle: A Climate Change Perspective

The Water Cycle: A Climate Change Perspective

Discover which water cycle processes might play a role in climate change and what could be affected by Earth's changing climate. More...

Article
Windows to the Universe
With Water Cycle Changes, So Goes Salinity

With Water Cycle Changes, So Goes Salinity

How water circulates through its endless cycle affects salinity of the oceans. Learn how scientists measure this to improve their predictions of future climate trends and events. More...

Video
Space.com

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