The Blue Marble is an image of Earth taken on December 7, 1972, from a distance of about 29,000 kilometers (18,000 miles) from the planets surface. It was taken by the crew of the Apollo 17 spacecraft on its way to the Moon, and is one of the most reproduced images in history.. It mainly shows the Earth from the Mediterranean Sea to Antarctica. This was the first time the Apollo trajectory ...Marble is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite.Marble is typically not foliated, although there are exceptions.In geology, the term marble refers to metamorphosed limestone, but its use in stonemasonry more broadly encompasses unmetamorphosed limestone. Marble is commonly used for sculpture and as a building material
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