(Encyclopedia) Dana, James Dwight, 1813–95, American geologist, mineralogist, and naturalist, b. Utica, N.Y., grad. Yale, 1833. His studies of the S Pacific, NW United States, Europe, and elsewhere…
THAYER, Andrew Jackson, a Representative from Oregon; born in Lima, Livingston County, N.Y., November 27, 1818; attended the common schools; studied law; was admitted to the bar in 1849 and…
Geological timescaleTriassic period: 250–200 million years agoJurassic period: 200–145 million years agoCretaceous period: 145–65 million years agoDinosaurs roamed the planet for about 165 million…
Pestilence is contagious disease that spreads out of control, killing many people. Here are examples of some of the worst epidemics around the world. AIDS…
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Susan B. Anthony (1820-1906) is the first woman to appear on U.S. coinage. Anthony worked for nearly 70 years to bring suffrage (the right to vote) to…
(Encyclopedia) glacial periods, times during which large portions of the earth's surface were covered with thick glacial ice sheets. In the Pleistocene epoch, in the Carboniferous and Permian periods…
WHAT IS A CONTINENTAL ISLAND? HOW ARE VOLCANIC ISLANDS FORMED? HOW DO CORAL REEFS FORM? FORMATION OF A CORAL ATOLLFIND OUT MOREAn island is an area of land smaller than a continent and entirely…
Millions of years from now, Los Angeles will be close to Alaska. Our world is moving constantly, spinning at a rate of 1,000 miles per hour. We are whirling around the sun at 20 miles per second.…
