Earth
Which pairs of minerals are almost always found together?
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What type of gem is the Star of Africa or the Cullinar II?
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What type of speleothems found in limestone caves grow upward from the floor?
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Which of these habitats is a dry one usually with sand and can sometimes be very hot?
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What submersible helped to discover the wreckage of the Titanic in 1986?
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What is a meteoroid called if it lands on the Earth's surface?
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What was the nationality of the scientist who demonstrated a heliocentric system?
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