snow thickness
61Climate change — For current and future climatological effects of human influences, see global warming. For the study of past climate change, see paleoclimatology. For temperatures on the longest time scales, see geologic temperature record …
62The Ozarks — Ozark redirects here. For other uses, see Ozark (disambiguation). Ozark Mountain redirects here. For the wine region, see Ozark Mountain AVA. The Ozarks, Ouachitas, Black Hills, and Sawtooths …
63Sea ice — is largely formed from seawater that freezes. Because the oceans consist of saltwater, this occurs below the freezing point of pure water, at about 1.8 °C (28.8 °F). Sea ice may be contrasted with icebergs, which are chunks of ice shelves or… …
64Kenneth Arnold — Infobox Person name = Kenneth A. Arnold image size = 175px caption = Showing a drawing of the crescent shaped object birth date = birth date|1915|03|29 birth place = Sebeka, Minnesota death date = death date and age|1984|01|16|1915|03|29 death… …
65Metal roof — A metal roof, often referred to as a tin roof, is a roofing system made from metal pieces or tiles. It is a component of the building envelope. Enough corrugated zinc/aluminium sheeting to cover an average sized house, transported by motor cycle …
66Bering Sea and Strait — ▪ sea, Pacific Ocean Introduction Russian Beringovo More and Proliv Beringa, northernmost part of the Pacific Ocean, separating the continents of Asia and North America. To the north the Bering Sea connects with the Arctic Ocean through the …
67Nansen's Fram expedition — Fram leaves Bergen on 2 July 1893, bound for the Arctic Ocean Nansen s Fram expedition, 1893–1896, was an attempt by the Norwegian explorer …
68R-value (insulation) — The R value or R value is a measure of thermal resistance (K·m²/W) [Oak Ridge National Laboratory, [http://www.ornl.gov/sci/roofs+walls/insulation/ins 02.html Which Kind Of Insulation Is Best?] , retrieved 2008 07 13.] used in the building and… …
69sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …
70Cross-country skiing — Priit Narusk in the qualification for the Tour de Ski in Prague. Nickname(s) XC skiing Characteristics Categorization Outdoor or indoor in ski tunn …
