Precambrian time, period of time extending from about 4.6 billion years ago (the point at which Earth began to form) to the beginning of the Cambrian Period, 541 million years ago. Precambrian time encompasses the Archean and Proterozoic eons, which are formal geologic intervals that lasted from 4 billion to about 541 million years ago, and the Hadean Eon, which is an informal interval spanning from 4.6 billion to 4 billion years ago. The Precambrian represents more than 80 percent of the total geologic record.
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After the accident, NASA reduced the amount of flammable Velcro in the crew cabin, and tested many of the capsule's materials for flammability. Now, as a result of the lessons learned from Apollo 1, many new materials have been developed for spaceflight with fire safety in mind.
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Antonio Vivaldi <span>composed </span>the masterpiece "<span>The Four Seasons". The Four Seasons is a group of four violin concerti which gives musical expression to each season of the year. This was published in 1725 in Amsterdam. This provide the most – detailed example of a music with a narrative element called the program music.</span>
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The Organization of African Unity (OAU) was postcolonial Africa’s first continent-wide association of independent states. Founded by thirty-two countries on May 25, 1963, and based in Addis Ababa, Ethiopia, it became operational on September 13, 1963, when the OAU Charter, its basic constitutional document, entered into force. The OAU’s membership eventually encompassed all of Africa’s fifty-three states, with the exception of Morocco, which withdrew in 1984 to protest the admission of the Saharan Arab Democratic Republic, or Western Sahara. The OAU was dissolved in 2002, when it was replaced by the African Union.
The process of decolonization in Africa that commenced in the 1950s witnessed the birth of many new states. Inspired in part by the philosophy of Pan-Africanism, the states of Africa sought through a political collective a means of preserving and consolidating their independence and pursuing the ideals of African unity. However, two rival camps emerged with opposing views about how these goals could best be achieved. The Casablanca Group, led by President Kwame Nkrumah (1909–1972) of Ghana, backed radical calls for political integration and the creation of a supranational body. The moderate Monrovia Group, led by Emperor Haile Selassie (1892–1975) of Ethiopia, advocated a loose association of sovereign states that allowed for political cooperation at the intergovernmental level. The latter view prevailed. The OAU was therefore based on the “sovereign equality of all Member States,” as stated in its charter.
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<em>The 'Youth Bulge Theory' is a concept which determines young men and women as an increasing population as well as volatile historically. </em>
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It occurs particularly in least developed countries and mainly in developing countries. This theory identifies the idea of raising potential for rebellion by the presence of even more than 20 percent of young people. 'Youth Bulge Theory' is helpful in decreasing infant mortality rates. Hence, the Youth Bulge theory of South Africa best explains this theory.
