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EnchantedLearning.com
ALL ABOUT OCEANS AND SEAS
Introduction Why is the Ocean Salty? What Causes Waves? Tsunami The Water Cycle Ocean Animal Printouts Ocean Crafts
Why is the Ocean Blue? What Causes Tides? Hurricane Undersea Explorers Coral Reefs Intertidal Zone Sunlit (Euphotic) Zone Ocean Printouts

The Watercycle

The Water Cycle (also known as the hydrologic cycle) is the journey water takes as it circulates from the land to the sky and back again.

The Sun's heat provides energy to evaporate water from the Earth's surface (oceans, lakes, etc.). Plants also lose water to the air (this is called transpiration). The water vapor eventually condenses, forming tiny droplets in clouds. When the clouds meet cool air over land, precipitation (rain, sleet, or snow) is triggered, and water returns to the land (or sea). Some of the precipitation soaks into the ground. Some of the underground water is trapped between rock or clay layers; this is called groundwater. But most of the water flows downhill as runoff (above ground or underground), eventually returning to the seas as slightly salty water.

WHY ARE THE OCEANS SALTY?

Oceans cover about 70% of the Earth's surface. The oceans contain roughly 97% of the Earth's water supply.
As water flows through rivers, it picks up small amounts of mineral salts from the rocks and soil of the river beds. This very-slightly salty water flows into the oceans and seas. The water in the oceans only leaves by evaporating (and the freezing of polar ice), but the salt remains dissolved in the ocean - it does not evaporate. So the remaining water gets saltier and saltier as time passes.

Web Links On the Water Cycle and the Oceans


Water Cycle Diagram: Label Me! Printout

Label the diagram of the hydrologic cycle - how water circulates on earth.
Answers
Watercycle

Water Cycle Find It! Quiz

A quiz on the Earth's water cycle to solve using the Little Explorers picture dictionary.


Readers Theater Script: Water Cycle Adventure

A short play for students to read while learning about the water cycle.


The Earth's Oceans

Learn all about the Earth's oceans.





EnchantedLearning.com
ALL ABOUT OCEANS AND SEAS
Introduction Why is the Ocean Salty? What Causes Waves? Tsunami The Water Cycle Ocean Animal Printouts Ocean Crafts
Why is the Ocean Blue? What Causes Tides? Hurricane Undersea Explorers Coral Reefs Intertidal Zone Sunlit (Euphotic) Zone Ocean Printouts


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