US Geological Survey
Usgs: Imperiled National Treasures: u.s. Coral Reefs
Efforts to protect and conserve coral reefs located in territories of the United States fall into the hands of the USGS. Scientists are working diligently to understand the marine ecosystems so as to determine the exact reasons many are...
US Geological Survey
Usgs: Plate Tectonics, Hot Spots, and Ring of Fire: World Map
A world map featuring active volcanoes, plate tectonics, hot spots, and ring of fire.