Columbia Encyclopedia

Search results

500 results found

water, desalination of

(Encyclopedia)water, desalination of, process of removing soluble salts from water to render it suitable for drinking, irrigation, or industrial uses. The principal methods used for desalination include distillatio...

tropics

(Encyclopedia)tropics, also called tropical zone or torrid zone, all the land and water of the earth situated between the Tropic of Cancer at lat. 231⁄2°N and the Tropic of Capricorn at lat. 231⁄2°S. Every po...

Farewell, Cape

(Encyclopedia)Farewell, Cape, southernmost point of Greenland, on Egger Island, at lat. 59°46′N. Egger Island and the surrounding islands are called the Cape Farewell Archipelago. ...

West Quoddy Head

(Encyclopedia)West Quoddy Head, promontory extending into the Atlantic Ocean, SE Maine, SE of Lubec; the easternmost point in the continental United States. A lighthouse is there. ...

equinox

(Encyclopedia)equinox ēˈkwĭnŏks [key], either of two points on the celestial sphere where the ecliptic and the celestial equator intersect. The vernal equinox, also known as “the first point of Aries,” is t...

lever

(Encyclopedia)CE5 Classes of levers: A first-class lever (A), a second-class lever (B), and a third-class lever (C) lever, simple machine consisting of a bar supported at some stationary point along its length ...

Lewis Hills

(Encyclopedia)Lewis Hills, section of the Long Range, W Newfoundland island, Canada, S of the Bay of Islands. It rises to 2,672 ft (814 m), the highest point on the island. ...

reflection

(Encyclopedia)CE5 Image formation by curved mirrors and lenses reflection, return of a wave from a surface that it strikes into the medium through which it has traveled. The general principles governing the ref...

ethanol

(Encyclopedia)ethanol ĕthˈənōlˌ [key] or ethyl alcohol, CH3CH2OH, a colorless liquid with characteristic odor and taste; commonly called grain alcohol or simply alcohol. Ethanol is used extensively as a solv...

oil gas

(Encyclopedia)oil gas, any of a group of fuel gases produced from oil by exposing it to high temperatures. High-Btu oil gas is so called because of its high heating value; it is often used to supplement natural gas...