Humans depend on freshwater for drinking as well as for domestic, agricultural, and industrial uses. Careless and wasteful use of this renewable but high-demand natural resource contributes to water depletion. This video segment provides a look at a house in Tuscon, Arizona that is equipped with water conservation devices that cut its household water consumption in half. There is also discussion of ... Full description.

All of Earth's living things depend on healthy, life-sustaining ecosystems for their survival. But continued human population growth, combined with the planet's limited supply of natural resources, might generate disastrous consequences for our shared environment. This interactive quiz tests users' knowledge of demographics, population trends, consumption, and sources of environmental damage. Annotated ... Full description.

This is a series of interactive modules that explore the history of life on Earth, while focusing on the processes of science. Each module contains suggested lesson plans and an extensive teacher's guide. In addition, each module has a suggested grade level and an adaptable grade level. Full description.

This site provides earth science student activities in PDF format, organized by grade level and national science and math objectives. Most of the activities use the data or images from Earth Update (available on the web or using the "Earth Update" CD-Rom). Activities include both inquiry-based and guided data exploration. Full description.