Earth

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

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Where was the lowest world temperature, -128.6 degrees?
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What was TIROS I, launched on April 1, 1960?
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What is the tendency of Earth's rotation to turn winds called?
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What kind of rain is bad for the environment?
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Which of these types of energy is cleanest and causes the least pollution?
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What substance, added to fog, makes smog?
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What layer of the Earth is right below the crust?
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What is the name of the fossil resin that is often used in jewelry making?
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