Earth

What is another name for permanently frozen ground?

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Which of these types of energy is cleanest and causes the least pollution?
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What is the term for when pieces of glaciers break off and form icebergs?
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What are the rocks that glaciers carry with them to far places called?
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Abnormally warm weather in autumn is called what?
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What reef is the largest living structure on Earth?
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What arc is created by refraction and light?
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The science term "weather vane" is best defined as which of these?
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John Glenn first orbited the earth in what year?
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