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coal
A combustible sedimentary rock formed by decomposition of vegetation. Mostly made from carbon, but also sulfur, hydrogen, oxygen and nitrogen. It is a fossil fuel and the largest generator of energy in the world.
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Capital of Kievan Rus (c.882-1240). Kiev was already a flourishing town when captured by the Varangian (Viking) Askold in about 860. Askold was ...
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