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The maximum frost depth observed in the contiguous United States ranges from 0 to 8 feet (2.4 m). [1] Below that depth, the temperature varies, but is always above 0 °C (32 °F). Alternatively, in Arctic and Antarctic locations the freezing depth is so deep that it becomes year-round permafrost, and the term "thaw depth" is used
Glacial erratic boulders of King County are large glacial erratic boulders of rock which were moved into King County, Washington by glacial action during previous ice ages.. The Pleistocene ice age glaciation of Puget Sound created many of the geographical features of the region, including Puget Sound itself, [1] and the erratics are one of the remnants of that age. [2]
The Vashon Glaciation, Vashon Stadial or Vashon Stade is a local term for the most recent period of very cold climate in which during its peak, glaciers covered the entire Salish Sea as well as present day Seattle, Tacoma, Olympia and other surrounding areas in the western part of present-day Washington (state) of the United States of America. [1]
The term itself is borrowed from the notion of "frost line" in soil science, which describes the maximum depth from the surface that groundwater can freeze. Each volatile substance has its own frost line (e.g. carbon monoxide, [ 1 ] nitrogen , [ 2 ] and argon [ 3 ] ), so it is important to always specify which material's frost line is referred ...
Permafrost temperature profile. Permafrost occupies the middle zone, with the active layer above it, while geothermal activity keeps the lowest layer above freezing. The vertical 0 °C or 32 °F line denotes the average annual temperature that is crucial for the upper and lower limit of the permafrost zone, while the red lines represent seasonal temperature changes and seasonal temperature ...
Lake Cushman (Twana: ʔiluʔəɬ) [1] is a 4,014.6-acre (16.247 km 2) [2] lake and reservoir on the north fork of the Skokomish River in Mason County, Washington.The lake originally was a long narrow broadening of the Skokomish River formed in a glacial trough and dammed by a terminal moraine from the Vashon Glaciation during the most recent ice age.
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2020 - January 21: Washington reports the United States' first case of COVID-19. Washington would record the nation's first death from the disease the following month. 2021 - June & July: The 2021 Western North America heat wave kills 91 people in Washington, making it the state's second deadliest natural disaster on record. [26]