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Which volcanic rock is natural glass formed when lava cools so quickly that crystals cannot grow?
Answer
Obsidian
What is the name of the boundary between Earth’s crust and mantle?
Answer
Mohorovičić discontinuity
Which mineral group makes up most of Earth’s continental crust?
Answer
Feldspar
What is the only mineral on the Mohs scale assigned a hardness of 9?
Answer
Corundum
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Which mineral produces a violet variety called amethyst?
Answer
Quartz
What is the name of the boundary between Earth’s crust and mantle?
Answer
Mohorovičić discontinuity
Which mineral group makes up most of Earth’s continental crust?
Answer
Feldspar