(Encyclopedia) saturated fat, any solid fat that is an ester of glycerol and a saturated fatty acid. The molecules of a saturated fat have only single bonds between carbon atoms; if double bonds are…
(Encyclopedia) selection. In Darwinism, the mechanism of natural selection is considered of major importance in the process of evolution. Popular formulations sometimes envisage a struggle for…
(Encyclopedia) transplanting, in horticulture, the process of removing a plant from the place where it has been growing and replanting it in another. The major requirement in transplanting (…
(Encyclopedia) casting or founding, shaping of metal by melting and pouring into a mold. Most castings, especially large ones, are made in sand molds. Sand, mixed with a binder to hold it together,…
(Encyclopedia) pressure group, body, organized or unorganized, that actively seeks to promote its particular interests within a society by exerting pressure on public officials and agencies. Pressure…
(Encyclopedia) MentanaMentanamāntäˈnä [key], town (1991 pop. 30,360), in Latium, central Italy. On Nov. 3, 1867, Garibaldi was defeated there by French and papal troops during his unsuccessful…
(Encyclopedia) Port Republic, village, NW Va., on the South Fork of the Shenandoah River. During the Civil War, on June 8–9, 1862, the last battle of Confederate Gen. Stonewall Jackson's successful…
(Encyclopedia) Whipple, William, 1730–85, political leader in the American Revolution, signer of the Declaration of Independence, b. Kittery, Maine. Whipple, who had been a sea captain, was a…
Source: The Environmental Protection AgencyI. The Ozone Layer The Earth's atmosphere is divided into several layers. The lowest region, the troposphere, extends from the Earth's surface up to about…
