layer of ice frozen to the soil

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• Ice — This article is about water ice. For the broader concept of ices as used in the planetary sciences, see volatiles. For other uses, see Ice (disambiguation) …   Wikipedia

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• North American ice storm of 1998 — Ice Storm of 1998 An example of the damage to trees Storm type: Cyclonic system mixed ice/snow/rain Formed: January 4, 1998 Dissipated …   Wikipedia

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• Active layer — In environments containing permafrost, the active layer is the top layer of soil that thaws during the summer and freezes again during the autumn. In all climates, whether they contain permafrost or not, the temperature in the lower levels of the …   Wikipedia

• History of the Earth — For the history of modern humans, see History of the world. Geological time put in a diagram called a geological clock, showing the relative lengths of the eons of the Earth s history The history of the Earth describes the most important events… …   Wikipedia

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