upward gradient
91Neural tube — Transverse section of half of a chick embryo of forty five hours incubation. The dorsal (back) surface of the embryo is towards the top of this page, while the ventral (front) surface is towards the bottom. (Neural tube is in green.) …
92Molecular machine — Part of a series of articles on Molecular Nanotechnology …
93Weather front — A weather front is a boundary separating two masses of air of different densities, and is the principal cause of meteorological phenomena. In surface weather analyses, fronts are depicted using various colored lines and symbols, depending on the… …
94Chapel Inclined Plane — The Chapel Inclined Plane is an inclined plane immediately to the south of Chapel en le Frith, High Peak, Derbyshire. Purpose The ground here rises sharply and the inclined plane was built to connect the lower and upper levels of the Peak Forest… …
95Pakistan — /pak euh stan , pah keuh stahn /, n. 1. Islamic Republic of, a republic in S Asia, between India and Afghanistan: formerly part of British India; known as West Pakistan from 1947 71 to distinguish it from East Pakistan (now Bangladesh).… …
96waterfall — /waw teuhr fawl , wot euhr /, n. 1. a steep fall or flow of water in a watercourse from a height, as over a precipice; cascade. 2. a manner of arranging women s hair, as in long, loose waves. [bef. 1000; ME; OE waetergefeall. See WATER, FALL] * * …
97Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
98ascent — noun Etymology: irregular from ascend Date: circa 1596 1. a. the act of rising or mounting upward ; climb b. an upward slope or rising grade ; acclivity c. the degree of elevation …
99Force — For other uses, see Force (disambiguation). See also: Forcing (disambiguation) Forces are also described as a push or pull on an object. They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate …
100Lift (force) — For other uses, see Lift. Boeing 747 8F landing A fluid flowing past the surface of a body exerts a surface force on it. Lift is the component of this force that is perpendicular to the …
