It's About Time/AGI

• "Photo Gallery" - USDA-NRCS
  This site includes a written description of different soil types and a photograph and United States distribution map for each soil type.
• "Keys to Soil Taxonomy" - USDA-NRCS
  Online textbook covers a wide range of topics, including which soils scientists classify and how they classify them.

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• Soil Compisition and Formation - NOAA Coastal Services Center
  Brief summary of soil horizons and the mechanisms that produce them. Click on significant terms to view a definition.
• "Soil forming factors" - The Encyclopedia of Earth, Boston University
  This article reviews how soil is formed from the erosion of rocks exposed at the Earth's surface.

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• "Photo Gallery" - USDA-NRCS
  This site includes a written description of different soil types and a photograph and United States distribution map for each soil type.
• Examination and Description of Soils - USDA-NRCS
  Excerpt from the text "Soil Survey Manual". This very detailed review defines the different soil horizons and transitional zones. Site also explains soil horizon nomenclature.

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• "Soil Quality Information Sheets" - USDA-NRCS
  PDF documents (you must have Adobe Acrobat to view these files), each addressing a different soil resource issue, including erosion, salinization, soil biodiversity, and much more. Each sheet includes text and good color images.
• "Urban Soil Quality Information" - NRCS
  Three fact sheetts (PDF, need Adobe Acrobat to view) which cover soil erosion and sedimentaion on construction sites, urban soil compaction, and heavy metal soil compaction.

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• "Photo Gallery" - USDA-NRCS
  This site includes a written description of different soil types and a photograph and United States distribution map for each soil type.
• "List of Soil Surveys by State" - USDA-NCRS
  Click on your state to be linked to your state's soil office.

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