CK-12 Foundation
Ck 12: Fourth Grade: Earth Science: Erosion and Deposition by Flowing Water
[Free Registration/Login may be required to access all resource tools.] Discusses how flowing water causes erosion; describes how runoff, streams, and rivers change Earth's surface; and identifies features caused by groundwater erosion.
Museum of Science
Oceans Alive: The Water Planet
Check out this simple overview of the water cycle and learn how to build a model of the water cycle.
Missouri Botanical Garden
Missouri Botanical Garden: Rivers and Streams
The Evergreen Project profiles the natural history of rivers and streams. Topics include watersheds, how a stream becomes a river, erosion, water pollution, and the like.
CK-12 Foundation
Ck 12: Biology: Water Cycle
[Free Registration/Login may be required to access all resource tools.] Covers the water cycle.
University Corporation for Atmospheric Research
Ucar: The Water Cycle
This site provides a comprehensive introduction to the water cycle. Students construct a model to simulate parts of the water cycle. Includes background information, links to standards, lesson plans, and assessment ideas.
Center for Educational Technologies
Earth Science Explorer: The Water Cycle
This is a very brief overview of the water cycle, but it does have a nice graphical representation.
US Geological Survey
Usgs: Earth's Water: Lakes and Reservoirs
The USGS reviews the differences between lakes and reservoirs. They discuss the history of freshwater and salt water lakes. Click Home to access the site in Spanish.
US Geological Survey
Earth's Water: Rivers and Streams
The USGS explains the definition of a river and how a river is supplied with water. Included is a cross section of a river. Click Home to access the site in Spanish.
Missouri Botanical Garden
Missouri Botanical Garden: The Water Cycle
This simple overview provides definitions of key terms in the water cycle and a diagram showing the path water takes in this cycle.
CK-12 Foundation
Ck 12: Earth Science: Water Pollution
[Free Registration/Login may be required to access all resource tools.] Describes the sources of water pollution, such as municipal, industrial, and agricultural.
CK-12 Foundation
Ck 12: Earth Science: Water Pollution
[Free Registration/Login may be required to access all resource tools.] Describes the sources of water pollution.