Columbia Encyclopedia

(Encyclopedia)  CE5 Alberta ălbûrˈtə [key], province, 255,285 sq mi (661,188 sq km), including 6,485 sq mi (16,796 sq km) of water surface, W Canada. Alberta was originally part...

(Encyclopedia) quantum theory, modern physical theory concerned with the emission and absorption of energy by matter and with the motion of material particles; the quantum theory and the theory of relativity togethe...

(Encyclopedia) time, sequential arrangement of all events, or the interval between two events in such a sequence. The concept of time may be discussed on several different levels: physical, psychological, philosophi...

(Encyclopedia) modern architecture, new architectural style that emerged in many Western countries in the decade after World War I. It was based on the “rational” use of modern materials, the principles of funct...

(Encyclopedia) geography, the science of place, i.e., the study of the surface of the earth, the location and distribution of its physical and cultural features, the areal patterns or places that they form, and the ...

(Encyclopedia) museums of art, institutions or buildings where works of art are kept for display or safekeeping. The word museum derives from the Greek mouseion, meaning temple to the works of the Muses. This articl...

(Encyclopedia) missions, term generally applied to organizations formed for the purpose of extending religious teaching, whether at home or abroad. It also indicates the stations or the fields where such teaching is...

(Encyclopedia) Presidents of the United States

(Encyclopedia) World War I, 1914–18, also known as the Great War, conflict, chiefly in Europe, among most of the great Western powers. It was the largest war the world had yet seen. World War I and the resul...

(Encyclopedia) light, visible electromagnetic radiation. Of the entire electromagnetic spectrum, the human eye is sensitive to only a tiny part, the part that is called light. The wavelengths of visible light range ...