• The Biogeographer: newsletter of the Biogeography Specialty Group of the Association of American Geographers--see what biogeographers are doing
• Botanic Sorting Machine: access to photos and information on many plant species, especially those found in the Netherlands and Suriname. Arranged by genera.
• Aquatic biomes
• "The World's Biomes" by Biomes Group, Fall 1996 Biology 1B Class, UC Berkeley
• "Biomes of the World" by Dennis Paulson, University of Puget Sound

Climates

• Lamont-Doherty Earth Observatory many detailed analyses of current global and regional climate, as well as historical data.

Diversity

• Biodiversity maps, US and Canada at The National Geographic Society's site.

Natural History

• Museum of Paleontology, UC-Berkeley: On-line exhibits dealing with the history of life which may be accessed according to time period or taxon. Also contains exhibit on evolution and a glossary. Especially relevant is the exhibit on the Pleistocene and its links to other sites.
• Maps and descriptions of Quaternary environments around the world. Scroll down to find these.
• The Midwest during the Ice Ages: on-line exhibit at the Illinois State Museum. Photos and descriptions of the Pleistocene megafauna may be particularly useful.
• Here are a couple of good sites on the fynbos and the Cape Floral Kingdom: Fynbos: a Kingdom Threatened and EnviroFacts Guide to Fynbos.
• Virginia's Natural Heritage Program: access to lists, descriptions, and maps of Virginia's rare species, invasive species, natural communities and ecosystems and natural area preserves.

Oceans

• NOAA Geosciences Lab satellite altimeter data for sea level analysis, El Nino, sea floor topography

Soils

Tectonics

• Plate tectonics: description and animations.

• Temperature Conversion Calculator Convert between Fahrenheit, Celsius, Kelvin, and even Reamur!

• US Geological Survey Home Page
• USGS Global Land Information System (Earthexplorer search tool for maps and imagery - buy geo data sets from USGS)
• GSC Atlantic's Earth Science Site of the Week