sheet mica
41Asbestos — For other uses, see Asbestos (disambiguation). Fibrous asbestos on muscovite …
42Video camera tube — In older video cameras, before the mid to late 1980s, a video camera tube or pickup tube was used instead of a charge coupled device (CCD) for converting an optical image into an electrical signal. Several types were in use from the 1930s to the… …
43North America — North American. the northern continent of the Western Hemisphere, extending from Central America to the Arctic Ocean. Highest point, Mt. McKinley, 20,300 ft. (6187 m); lowest, Death Valley, 276 ft. (84 m) below sea level. 400,000,000 including… …
44Dicopper chloride trihydroxide — IUPAC name Dicopper chloride trihydroxide …
45Economy of Sudan — Macro economic trend = Sudan s primary resources are agricultural, but oil production and export are taking on greater importance since October 2000. Although the country is trying to diversify its cash crops, cotton and gum Arabic remain its… …
46Geology of the Australian Capital Territory — Australia grew around three fused pieces of very ancient continental crust (cratons). The geology of the Australian Capital Territory includes rocks dating from the Ordovician around 480 million years ago, whilst most rocks are from the Silurian …
47Nontronite — from Slovakia General Category Smectite Phyllosilicate Che …
48Tierra — «Planeta Tierra» redirige aquí. Para la serie documental, véase Planeta Tierra (documental). Para otros usos de este término, véase Tierra (desambiguación). Tierra …
49Australia — /aw strayl yeuh/, n. 1. a continent SE of Asia, between the Indian and the Pacific oceans. 18,438,824; 2,948,366 sq. mi. (7,636,270 sq. km). 2. Commonwealth of, a member of the Commonwealth of Nations, consisting of the federated states and… …
50soil — soil1 soilless, adj. /soyl/, n. 1. the portion of the earth s surface consisting of disintegrated rock and humus. 2. a particular kind of earth: sandy soil. 3. the ground as producing vegetation or as cultivated for its crops: fertile soil. 4. a… …
