Watersheds are those land areas that catch rain or snow and drain to specific marshes, streams, rivers, lakes, or to ground water. This site allows users to locate their watershed by city, county, state, or region. Links provide information about stream flow, water use, conservation efforts, demographics, forest riparian habitats, science in your watershed, water discharges, and assessment of watershed ... Full description.

This learning system provides a variety of materials on Earth and space sciences, such as images, movies, animations, and data sets. Students, teachers, and the general public can access information on the sun and space weather, astronomy, our planet and solar system, current space missions, space-related mythology and art, and geology. For teachers, there are links to tools for navigating the site, ... Full description.

This teacher's guide for rocketry presents the history, scientific principles and mathematics of rockets through problem-solving and cooperative learning activities. These activities demonstrate the physical principles behind the operation of rockets. Full description.

This NASA educator guide tells the story of why it is important to observe celestial objects from outer space and how to study the entire electromagnetic spectrum. It features a set of hands-on activities and demonstrations which can be performed by teachers to reinforce the concept that Earth's atmosphere interferes with the passage of electromagnetic radiation and to investigate the properties and ... Full description.

This collection of sounds contains recordings of five types of electromagnetic or radio emissions produced by the magnetosphere. The sounds are accompanied by written descriptions of how they are propagated and by spectrograms which provide a graphic display of their frequency distributions. Full description.

Gases have various observable properties, such as pressure (p), temperature (T), mass (m), and volume (V). Careful scientific observation has determined that these variables are related to one another, and the values of these properties determine the state of the gas. Users can read an explanation of the three laws (Boyle's Law, Charles' Law, and Gay-Lussac's Law) that describe the properties of gases ... Full description.

This webpage is part of the University Corporation for Atmospheric Research (UCAR) "Windows to the Universe" program. It describes the nature and configuration of magnetic fields, which are the result of moving electric charges, including how they cause magnetic objects to orient themselves along the direction of the magnetic force points, which are illustrated as lines. Magnetic field lines by convention ... Full description.

This tutorial introduces students to the concepts of electromagnetic waves, wavelength, and the electromagnetic spectrum. Diagrams and written descriptions explain how wavelength is measured and explore the traditional divisions of the spectrum: radio, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Full description.

This is part of the Exploratorium website. It provides links to resources and exhibits that define and illustrate the concept of periodic motion. Full description.

This educational brief provides an overview of the concepts of radioactivity, basic particle physics, and the use of radioactive decay as a mechanism to date our galaxy. Full description.