This video segment adapted from Last Oasis explores the use of new dams as a way to provide or store water. In the 1990s, the city of Denver was looking for a new source of water for its growing population, and its plan to build a new dam suddenly became highly controversial.

This module provides an introduction to the chemical properties of water. The dipole across the molecule, hydrogen bonding, surface tension,and solvation are all introduced.

In this video segment adapted from ZOOM, visit a water treatment plant and learn how water from a local reservoir is turned into drinking water.

This simulation from the National Center for Atmospheric Research portrays annual patterns in water vapor and precipitation across the globe, illustrating general circulation patterns as well as seasonal and regional variation.

This module introduces the history of wave theories, basic descriptions of waves and wave motion, and the concepts of wave speed and frequency.

In this activity, students learn to interpret current weather maps. They will observe weather map loop animations on the internet, learn the concept of Zulu time (Universal Time Coordinated, UTC) and visualize the movement of fronts and air masses. They will then analyze a specific weather station model, generate a meteogram from their observations, and answer a set of questions about their observations.

Students learn how Newton's Law of Gravitation can be used to determine the mass of the Earth. By calculating mass and volume, they can then determine the Earth's density, and compare that result with the densities of other solar system bodies. Knowledge of Earth's density can also provide information about the planet's interior.

In this lesson, students develop a fundamental understanding of NASA’s Solar Dynamic Observatory (SDO) and the Sun’s structure and function.

This comic book was developed with the Stanford Solar Center as part of their comic series Tales from Stanford Solar and explores questions like: What color is the Sun? and How do we study the stars?

In this exercise, students investigate long-term weather variables such as temperature and humidity to determine their affect on the climate of a particular region. They will choose two cities, use an online resource to obtain geographic and climatic information for each, and use a spreadsheet program to produce graphs that compare data for the two cities.

This field investigation involves student dropping various objects into various mediums to find answers to questions that they propose, dealing with meteors and craters.

In this video from the Science and Technology Chat series, learn about astrobiology, an interdisciplinary field that uses biology, astronomy, and geology to study the origins of life on Earth and to search for possible life on other planets.

The activity describes Eratosthenes' experiments which determined that the Earth is spherical, rather than flat. Students reproduce Eratosthenes' methods using a slice of pizza to calculate the circumference of the entire pie.

Students investigate three-dimensional objects. They compare what constellations look like when seen from different angles. They make a model of a constellation and look at it from different sides to discover that the relative position of the stars changes depending on our perspective. They understand that stars are not located on the same plane and or the same distance.

The purpose of this resource is to introduce students to the concept that sometimes there is no one "right" answer to a question or measurement. Students learn to be careful when searching for a right answer to questions such as 'What time is it?' by comparing multiple measurements of the time of day. Students gain an intuitive understanding of the characteristics of imperfect measurements. Using different clocks, students simultaneously record the displayed times. The resulting time measurements are converted from minutes and seconds to seconds. These measurements are plotted to illustrate the mathematical techniques of averages and deviations from an average.

How can you safely view the August 21 solar eclipse? What is a solar eclipse? Where can you see this upcoming eclipse?

This lab activity uses the internal structure of newspaper (its fibers) to explore the ways in which the internal structure of a material can affect how it behaves. The findings can be related to the physical and chemical properties of minerals, which are influenced by their own internal molecular structures.

This fun Web site is part of OLogy, where kids can collect virtual trading cards and create projects with them. Here, they are given a big-picture look at astronomy.

In this activity, students investigate the mass, pressure, and temperature of air. They will measure and record the mass and temperature of a bottle of air as they increase its pressure by pumping in more air, record their observations, and answer some questions about what they have seen.

Students learn about the subtractive nature of white light in this Moveable Museum unit. It contains two procedures in which students "take apart" white light and then "put it back together again." The six-page PDF guide includes suggested general background readings for educators, activity notes, step-by-step directions, an easy-to-assemble color wheel, and information about where to obtain supplies. Students use special glasses to see that white light is made up of all the colors of the rainbow and then create a colorful top and spin it to see how the different colors blend into white.