This report provides an overview of the exchange of greenhouse gases, their influences on climate, viability of ecosystems, distribution of biomes, quantities of surface- and ground-water, and some research projects in place to investigate these influences. Topics include lake-atmosphere carbon dioxide exchange, sequestering and exchange of atmospheric carbon dioxide in boreal and subalpine forests, ... Full description.

This resource introduces students to the idea of saline water. Topics include how saline water is defined and how dissolved salt concentrations are expressed (parts per million). Parameters for the various ranges of salinity (fresh to highly saline, or seawater) are also presented, and there is a brief discussion of water quality considerations regarding saline water. Links to additional information ... Full description.

This fact sheet provides an overview of the gases emitted by volcanoes, which consist mostly of water vapor, carbon dioxide, and sulfur dioxide. Topics include reasons for studying them, potential hazards, methods for studying them, and some facts about the gases emitted by the eruption of Mount St. Helens. A downloadable, printable version is available. Full description.

This site is the homepage of the United States Geological Survey's (USGS) Coastal and Marine Geology Program. Materials available here include links to news articles and publications, topics of study, and regions of study. Search choices include topic, region or content type (research project, educational material, datasets, etc.). Study topics are grouped by coastal issues, marine/deep sea issues, ... Full description.