Geology is the study of the composition and physical properties of rocks, minerals, gems and other related earth materials, including diamonds and crystals. Scientists gain an understanding of the Earth's history by studying its composition.
  • Geologic Processes
  • Geologic Time Scale
  • Minerals
  • Paleontology

Saltpeter, the common name for potassium nitrate, a white, crystalline solid composed of potassium, nitrogen, and oxygen.

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How Archaeology Works

Archaeology is the study of humanity's material remains -- even a piece of an ancient pot can tell us a lot about the past. But how do archaeologists make sense of these relics?

What can we learn from computational archaeology?

While archaeological digs are still hands-on projects, some computer programs can help piece together a more complete picture of the site and even what its inhabitants might have looked like. What else can the software tell us?

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