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

This press release summarizes the results of research on sediment cores taken from the subtropical Atlantic Ocean. Analyses of organic molecules from planktonic algae in the sediments indicates that large and abrupt temperature changes in warm areas of the ocean occurred at the end of the last glacial period. Full description.

This illustration from an online textbook features a map showing the major ocean currents of the world. A set of links provides access to a study guide with glossary and test questions, additional readings, and links to related sites. Full description.

This article describes the effects of a coronal mass ejection that occurred in January 1997, and the damage it caused to commercial and communications satellites. Full description.

This document describes the features and properties of Earth's magnetosphere. Topics include the magnetosphere's shape, descriptions of its features, the Van Allen Belts, particle motions, and magnetic storms. Links to illustrations and tables are embedded on the text. Full description.

Visitors to this site can access information on tropical storms and hurricanes in the Atlantic Ocean as far back as 1851. Information provided here includes a yearly map showing the tracks of all storms, and individual maps for each storm. The individual maps are accompanied by data tables that show latitude, longitude, wind speed, dates, and times. Full description.

This document outlines the development of the theory of contintental drift and how many lines of evidence collected over several decades by various researchers were brought together to explain how the seafloor spreads and the continents move about. Links to additional information are included. Full description.

This press release explains how scientists have enhanced their ability to predict space weather by detecting active regions on the sun's surface on the far side of the Sun, before they rotate to its Earthward side. Using the SWAN instrument aboard the SOHO satellite, they are able to detect hydrogen atoms in space, which are being illuminated by radiation emitted from active regions (sunspots), even ... Full description.

Users can study an introduction to hydrologic techniques, questions, and processes. An extensive glossary of terms from the entire field of surface-water hydrology is included. References and a list of links to specific topics are also included. Full description.

Soil is the biologically active, structured porous medium that has developed below the continental land surface on our planet. This textbook covers all of the aspects of Soil Science at an introductory level and emphasizes the role of the pedosphere in Earth Systems Science. This preview version presents the complete text of some chapters and abridged text for others. Ordering information for the ... Full description.