Science

What protects our Earth from harmful rays?

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Ice pellets are also known as what?
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What vascular plants do not have seed-bearing flowers or fruits?
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Which kind of tree is most often struck by lightning?
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Which of these is not a Galilean satellite?
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What is the name for a tool that makes work easier to do?
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How many bones do sharks have in total?
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What part of the ear leads to the throat?
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Discovered by Alexander Fleming, what is now used to treat infections?
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