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What protects our Earth from harmful rays?
Science
What protects our Earth from harmful rays?
Oxygen layer
Ocean layer
Invis layer
Ozone layer
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What is the rate at which something moves called?
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Who discovered the supernova and was the first to theorize that stars "die"?
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Orange juice is a good source of which vitamin?
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What are the huge storms that the sun produces called?
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A ramp is an example of which of these simple machines?
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What is a machine capable of performing tasks automatically called?
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The four engines of a Boeing 747 jet produce 188,000 pounds (85,275 kilograms) of what?
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What cellular organelles produce proteins?
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