The Oak Ridge National Laboratory (ORNL) is host to one of NASA's ten Distributed Active Archive Centers (DAACs). These DAACs are part of NASA's Earth Observing System (EOS) Data and Information System (EOSDIS) Project, which forms an integral part of NASA's contribution to the U.S. Global Change Research Program. The ORNL DAAC provides information about the Earth's biogeochemical dynamics to the global change research community, policy makers, educators, and the general interested public. Biogeochemical dynamics may be defined as the chemical interactions among the Earth's surface, water, and air that produces changes in the Earth and its climate. Information available through the ORNL DAAC includes data from NASA's ground-based research programs and remotely-sensed observations as well as biogeochemical dynamics data and value-added products relevant to global change research collected by other agencies. For additional information, link to URL: