This diagram illustrates some of the most abundant stores of carbon and identifies some of the pathways in the carbon cycle along which carbon is transferred from one form to another. Long-term sinks of carbon are...
This interactive feature explains Darwin's theory of how low-lying coral islands called atolls form in tropical seas from once-towering volcanoes. Flash is required to view the content.
This interactive feature describes the demise of very large individual stars called supergiants, which explode and become Type II supernovae. It also describes how the process produces increasingly heavier elements....
This interactive feature introduces viewers to the various types of caves, and describes Karst activity, the process by which naturally-occurring acidic solutions form cavities in soluble rocks. Other topics include...
This interactive feature details the demise of a two-star system and its concluding event, a Type Ia supernova. Students may navigate through the feature's slides which explain the process. Illustrations are included....
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