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Use "protuberances" in a sentence
"Rig Veda, though mountains are called protuberances"
"“block of volcanic basalt, whose circumference is sprinkled with little crystals, pointed and straw-like, with rhombs of tile-red feldspath upon a dark background, like velvet or charcoal, except one of its protuberances, which is reddish.”"
""protuberances" or "prominences" was no longer doubtful; although further inquiry was needed for the determination of the particular species to which those vapours belonged."