These diagrams illustrate what a pressure gradient is and that air flows from regions of higher pressure to regions of lower pressure. Links to additional information are included. Full description.

This article discusses how graphic representations of data helped make recognizing patterns easier. The use of maps of surface temperature in the Pacific Ocean to detect El Nino events is cited as an example. Full description.

This document provides a brief introduction to supernova explosions. Topics include types of supernovae, causes of the explosions, and what happens to the material in a star after the explosion. Links to a glossary are embedded in the text. Full description.

This document discusses the loss of rainforest in South and Central America. Topics include the rate of disappearance and the primary causes. Links to conservation- and rainforest-related charitable sites are included. Full description.

In this module, students learn about the physical features, properties, and hazards associated with thunderstorms. Topics include dangers associated with thunderstorms, types and components of thunderstorms, and tornadoes. An additional section discusses the use of computer modeling to understand the formation and lifecycle of storm systems and in forecasting severe weather. Links to additional information ... 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.

Students can use this map to track the progress of hurricanes and tropical storms in the western Atlantic Ocean and Carribean Sea. It includes descriptions of hurricane watch and warning conditions. Full description.

This brief discussion of atmospheric ozone provides information on where this gas occurs, its harmful and beneficial effects, and the causes and possible consequences of the depletion of "good" ozone in the atmosphere. Full description.

In this activity, students construct data tables and graphs of ozone concentrations for selected locations using TOMS data for the years 1979 through 1992. Instructions and TOMS images are provided. Full description.

In this activity, students will learn about the magnetosphere, the effects of solar activity, and the importance of the Earth's magnetic field in protecting living organisms from solar radiation. Background information, a materials list, procedures, outcomes, and standards are included. Links to a glossary and to additional information are embedded in the text. Full description.