Eratosthenes 276–195 B.C. This Greek astronomer was the first to measure the size of Earth accurately. He determined that the earth's polar diameter was about 7,850 miles. (In fact, the distance is…
Abstract Expressionism A style developed in the mid-20th century. It emphasized form and color rather than an actual subject. Jackson Pollock and Willem de Kooning were abstract expressionists.…
There are several types of maps. Each show different information. Most maps include a compass rose, which indicates which way is north, south, east and west. They also include a scale so you can…
Perimeter The perimeter of a geometrical figure is the complete distance around that figure. To find the perimeter, simply add up the lengths of the figure's sides. Example: What is the perimeter…
Mayor: Frank G. Jackson (to Jan. 2017)2010 census population (rank): 396,815 (45); Male: 190,285 (48.0%); Female: 206,530 (52.0%); White: 147,929 (37.3%); Black: 211,672 (53.3%); American Indian…
Prehistorical and Ancient The megalithic passage tomb at Newgrange in Ireland covers over an acre and was constructed around 3200 B.C. Buried for centuries, the mound was rediscovered in 1699 and…
For centuries, animals have been used to help fight wars. Before there were tanks, soldiers rode their horses into battle. Pack animals such as camels, mules, and horses carried ammunition and…
