This Topic in Depth explores the world of frozen soil, including permafrost and tundra. The first site is provided by the Missouri Botanical Gardens Web site, entitled Tundra (1). This kids focused site does a good job of clearly explaining what tundra is, where it's located, and what types of plants and animals are found within tundra areas, as well as offering a photo gallery. The second site,...

For over a hundred years the Illinois State Water Survey, part of the Illinois Department of Natural Resources, "has documented quality data on a wide multitude of water and atmospheric variables". Within the main Web site is the Soil Temperatures page, which provides daily publication of maps based on data from various sites across the state. These include a 10am 4 inch bare soil temperature,...