Coal and wood are two sources which had been used extensively since the 18th century. when steel was commercialized heavily using the Bessemer Proces later at the 19th century. At this time, petroleum became the major energy source of energy and was even used extensilvely in other processes as converting petroleum to fuels.
I’m not sure but i think it is A
Socrates, Plato, and Aristotle are all influential philosophers from Greek.
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AFTER its defeat in World War II, Germany was divided into four zones under the control of the United States, Britain, France and the former Soviet Union. The division, nevertheless, was provisional. ... For the Western Powers, the economic reconstruction of Germany was given priority.
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