Smithsonian Institution
National Museum of Natural History: Paleobiology: Green River Fossil Collections
Search the collection of 35,000 fossiliferous rocks found within the Green River Formation of Colorado and Utah. View some of these 50 million year old insect fossils in a linked slide show.
Smithsonian Institution
National Museum of Natural History: Paleobiology: The Silurian Period
Journey into the past while reading this comprehensive overview of the Silurian Period that covers topics such as life in the seas, invasion of land, fossil evidence, and climate and geology.
Ohio State University
Ohio State University: Anthophyta, Evolution & Diversity
An online summary of the evolution of flowering plants at an advanced level. The text is supported by good illustrations and is followed by a quiz. This is a good review for exams.
Encyclopedia of Earth
Encyclopedia of Earth: Coal: Coal Fired Power Plants
Discuses how different types of coal-fired power plants work, and their advantages and disadvantages.
National Academies of Sciences, Engineering, and Medicine
The National Academies: Emerging Technologies: Advanced Coal Technologies
Coal is still widely used in energy production but is responsible for a third of the carbon dioxide emissions in the United States. New technologies, described here, are being developed to reduce or eliminate these emissions.