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Oceanography
People have only explored about 5% of the world's oceans, so we don't know all there is to know about them, but one of the limitations we have is the underwater pressure. Up here, on the surface of the Earth, we have a comfortable pressure of
History
The Middle Ages started in 500 AD (when the Roman Empire collapsed) and ended in 1500 AD (the beginning of the Renaissance). During this time were the dark ages, Crusades, the 100-year war, and other important events. The first part of the Middle Ages (called the Dark Ages) started in
Biology
Brain surgery began a long time ago. Since ancient times, people have been trying to figure out the brain and help people who had problems with it. People had developed a method for helping out, called trepanning. Trepanning was the process of drilling a small hole in the patient'
History
The Incas were an advanced civilization in South America. They were ahead of the Aztecs and many other ancient civilizations in North America because they knew how to mine for precious ores and useful metals. Mining was mandatory in the Inca Kingdom. It was part of the tax obligation from
History
The Songhai Empire of West Africa began in 1375 and ended in 1591. This empire began when Mali started being weakened and the Songhai people rebelled, fighting back and setting up their capital in the city of Gao. The Songhai eventually took over (under the rule of the former military
Oceanography
Maps have been along for a long time. The oldest map known is a Babylonian world map from the Fifth Century BC. It is a circular map with Babylon at the center and seven other cities around it. Some parallel lines are thought to represent the Southern Marshes, and a
History
In medieval times, many kingdoms existed in Africa. This is a list of the seven most important. The Axum Kingdom existed between 100 to 940 A.D. It was one of the most important kingdoms in those times and controlled many lands next to and across the Red Sea. Coins
History
380: Christianity becomes the state religion of the Roman Empire, the leaders are called patriarchs. 395: The Byzantine Empire is created by Emperor Constantine I. He changed the name of a Greek city named Byzantium and called it Constantinople, making it the capital of his new kingdom. 529: Justinian I
Oceanography
The world ocean is splint into four basins. Each of these basins are large parts of the ocean, called the Pacific, Atlantic, Indian, and Arctic basins. The Pacific basin (these are also called oceans) is the largest and deepest of them all and contains about half of the world'
Literature
This is a list of the characters that appear in the first section of “The Pilgrim's Progress”. Christian Christian is a man who lived in The City of Destruction (the world). One day, he reads The Book (the Bible) and is convinced that the city he lives in
History
Pope Urban II started the crusades for more than just one reason. The first (and most obvious) reason was to reconquer Jerusalem, which was occupied by the Muslims. Another reason might have been that Pope Urban wanted to force the Byzantines to convert to Catholicism and thus unify the Churches.
Biology
The nervous system is a very important part of the body because if we didn't have it, we would not be able to do anything. The nervous system starts with the brain, which is connected to the spinal cord, which goes down your spine. This is why a