In astronomy, the geocentric model (also known as geocentrism, often exemplified specifically by the Ptolemaic system) is a superseded description of the Universe with Earth at the center. Under the geocentric model, the Sun, Moon, stars, and planets all orbit Earth.
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Once it was introduced at the third battle of Ypres, mustard gas produced 90% of all British gas casualties and 14% of battle casualties of any type.Explanation:
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To protect this valuable trade, Egypt gradually conquered most of Nubia. Egyptians called this region Kush. The Nubians also had to pay tribute to the pharaoh. Tribute is a payment made by a conquered people to a stronger power.
