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In most parts of the world, water is a scarce resource. That might seem strange, because there is so much water on Earth. Almost all of the water on Earth, more than 97 percent of it, is seawater in the oceans. The rest is called fresh water, because it does not have a high salt content. Most of the world’s fresh water is frozen solid in large glaciers in Antarctica and Greenland. Almost all of the fresh water that is available for human use is either contained in soil and rock below the surface, called groundwater, or in rivers and lakes.

Teaching Resources from the Education Resources Network

Curricula & Instruction Resources

Cave in Carlsbad Caverns
Resource Type: Classroom Activities

Caves form through a variety of natural processes depending on their local geology and climate....

Abrams Falls in Great Smoky Mountains National Park
Resource Type: Classroom Activities

The ocean is the key element in Earth's hydrologic cycle (water cycle). Students will construct...

Earth from Space showing Africa and Antarctica
Resource Type: Curriculum Materials

Introducing a new publication from Earth Observatory - EO Kids - bringing engaging science...


Teaching Media Resources

Florida Mangrove roots
Resource Type: Videos or Animations

From Discovery Channel's series "Time Warp" where MIT scientist and teacher Jeff Lieberman and...

Connecticut River in Long Island
Resource Type: Videos or Animations

Where rivers meet the ocean, coastlines tend to bend either inward or outward, creating...

Mississippi River flooding in Missouri
Resource Type: Videos or Animations

Explore and experience the forces that shape the world around us. No natural disaster in America...


Outreach Programs

Black sand beach, Hawaii
Resource Type: Online Outreach Programs

Maps on Hawaii's water and geology; Location: Honolulu, Hawaii

Coral Reef fish
Resource Type: Commemorative Days and Events

A healthy world ocean is critical to our survival. Every year, World Oceans Day provides a...

Cloud to ground and cloud to cloud lightning
Resource Type: Commemorative Days and Events

The World Meteorological Organization has its fundamental mission to support the countries of...