Students examine how water changes state, from a liquid to a solid.  In this water lesson students study the water cycle and how temperature and pressure effect it. 

Students develop an understanding of our planet as a system by designing a very-long-duration space mission in which the life-support system is patterned after that of earth.

This resource is from the Strategic Environmental Research and Development Program (SERDP), an environmental research arm of the Department of Defense. It explains how sediment contamination has affected DoD facilities and what is being...