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Plutonism is the geologic theory that the igneous rocks forming the Earth originated from intrusive magmatic activity, with a continuing gradual process of weathering and erosion wearing away rocks, which were then deposited on the sea bed, re-formed into layers of sedimentary rock by heat and pressure, and raised again. It proposes that basalt is solidified molten magma. The name "Plutonism" references Pluto, the classical ruler of the underworld, while "volcanism" echoes the name of Vulcan, the ancient Roman god of fire and volcanoes. The Oxford English Dictionary traces use of the word "plutonists" to 1799, and the appearance of the word "Plutonism" to 1842.