Earth

Ruby and sapphire are gem forms of which mineral?

More Questions from Earth
What is the cooler air rushing down a mountainside called?
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What family are both poison oak and poison ivy part of?
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What two countries lie on opposite sides of the Juan de Fuca Strait?
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What is another name for permanently frozen ground?
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What are large bodies of air with similar temperatures and moisture content called?
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When does magma become lava?
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What causes the sound in a seashell?
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Which of the following is magnetic?
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