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cadmium

(Encyclopedia) cadmiumcadmiumkădˈmēəm [key] [from cadmia, Lat. for calamine, with which cadmium is found associated], metallic chemical element; symbol Cd; at. no. 48; at. wt. 112.411; m.p. 321℃; b.p…

transpiration

(Encyclopedia) transpiration, in botany, the loss of water by evaporation in terrestrial plants. Some evaporation occurs directly through the exposed walls of surface cells, but the greatest amount…

acid rain

(Encyclopedia) acid rain or acid deposition, form of precipitation (rain, snow, sleet, or hail) containing high levels of sulfuric or nitric acids (pH below 5.5–5.6). Produced when sulfur dioxide and…

skin diving

(Encyclopedia) skin diving, act of swimming freely underwater. It is done with the aid of a face mask, swimming fins for the feet, and either a snorkel breathing tube or scuba [acronym for self-…

stalactite and stalagmite

(Encyclopedia) stalactitestalactitestəlăkˈtīt [key] and stalagmitestalagmitestəlăgˈmīt [key], mineral forms often found in caves; sometimes collectively called dripstone. A stalactite is an icicle-…

Omaha, city, United States

(Encyclopedia) OmahaOmahaōˈməhä, –hô [key], city (1990 pop. 335,795), seat of Douglas co., E Nebr., on the west bank of the Missouri River; inc. 1857. The largest city in the state, it is a busy port…

recorder

(Encyclopedia) recorder, musical wind instrument of the flute family, made of wood, varying in length, and having an inverted conical bore (largest end near the mouthpiece). Its tone is produced by…

Abubakar, Abdulsalam Alhaji

(Encyclopedia) Abubakar, Abdulsalam Alhaji, 1942–, Nigerian military officer and political leader, b. Minna, Niger State. He served in the Nigerian air force (1963–67) and army (1967–99), achieving…

flotation process

(Encyclopedia) flotation process, in mineral treatment and mining, process for concentrating the metal-bearing mineral in an ore. Crude ore is ground to a fine powder and mixed with water, frothing…

Fairbanks

(Encyclopedia) Fairbanks, city (2020 pop. 32,515), Fairbanks North Star Borough, E central Alaska, on the Chena River near its confluence with the…