Curated OER
An Online Project - Comparing Terrestrial Ecosystems in Different States
Students investigate the similarities and differences in soils from different states with an analysis of its physical and chemical properties.
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.