Earth

What mineral makes both sapphires and rubies when cut and polished?

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What is a tornado that doesn't reach the ground called?
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What is the hard, dark substance found in the ground that is mined for fuel?
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What event is caused by radiation hitting the Earth's atmosphere?
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What percentage of known volcanoes are subaerial, meaning they erupt into the atmosphere?
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Which family does the herb angelica come from?
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What are the three main categories of rock?
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Which of these is not a metamorphic rock?
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What is the very sticky form of clay till called?
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