This document discusses possible factors that contributed to the formation of massive continental glaciers during four periods of geologic history. Full description.

This satellite image shows the brown sediment-laden water of the Mississippi River mixing wih the dark blue water of the Gulf of Mexico following a rainstorm. The city of New Orleans and Lake Ponchartrain can easily be discerned near the center of the image. Full description.

Visitors to this site can view satellite imagery and read an account of how remote sensing was employed to evaluate the extent of flooding and sediment load in rivers on the coastal plain of North Carolina as a result of Hurricane Floyd in September, 1999. This feature is part of NASA's Earth Observatory, a publication that focuses on Earth's climate and environmental change. Full description.

This activity has students create a Cartesian diver, which will act in some ways like a submarine. Students will adjust the amount of air and water in an inverted test tube (the "diver") so that it at first barely floats in a water-filled bottle. Then, they will squeeze the closed bottle to create higher water pressure, causing the diver to sink. Releasing the bottle allows the diver to float again. ... Full description.

This graphic illustration and accompanying text description show the distribution and relative proportions of water in the form of solid, liquid, and gas in Earth's lakes, rivers, oceans, polar ice, atmosphere, soil, and groundwater. Full description.

This description of a ground-water aquifer has a graphic representation to accompany it. It is part of the U.S. Geologic Survey's Water Science for Schools website. Links to other parts of the site, such as definitions and types of wells, are included. Full description.

This lesson focuses upon the scientific phenomenon of El Nino. Learners will also explore the possible link between human-induced global warming, and El Nino as a possible distributor of global warming's extra energy. Links to related sites are included. Full description.

This activity will allow the student to look at real-time satellite, radar, and derived imagery to study the growth and development of thunderstorms. Full description.

This site provides background information about the relationship between ocean currents and surface winds. There are links to images, JPL missions and instruments, and an El Nino site. Full description.

This site provides a description and graphic representation of the Coriolis Force, with links to a video and related sites. Full description.