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If you purchase an amethyst, you would have purchased a semiprecious gem stone.
Q10: Aristotle believed that the Sun, Moon, planets,
Q15: A shield volcano is produced by _.<br>A)
Q25: If you are holding a heavy mineral,
Q29: The three-cell model of global wind circulation
Q42: Dropping sea level causes Earth's albedo to
Q48: The seafloor spreading hypothesis was put forth
Q53: The past 10,000 years, during which civilization
Q65: If rock exceeds the limit beyond which
Q74: When the Moon passes directly between the
Q80: What is the wide band outside of