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mass extinction

(Encyclopedia) mass extinction, the extinction of a large percentage of the earth's species, opening ecological niches for other species to fill. There have been at least ten such events. The five…

What Is a City-State?

You've seen the word a thousand times, but what does it actually mean? City-states are small, independent areas that have full sovereignty over their domestic and international policies. Unlike in…

Richard Nixon's Resignation Speech

Given on Thursday, August 8, 1974 Good evening. This is the 37th time I have spoken to you from this office in which so many decisions have been made that shape the history of this nation.…

passion music

(Encyclopedia) passion music, choral music whose text depicts events immediately surrounding the crucifixion of Jesus. The earliest passions, composed from the 9th to the 14th cent., were monophonic…