Science
What is the opening of a lens, which controls the amount of light?
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What are the big holes and dents found on the Moon called?
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What planet in our solar system has the most liquid water on its surface?
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About how long does it take for sunlight to reach the Earth from the Sun?
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What is energy from the internal heat of the Earth called?
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Where are the male sperm cells formed in flowering plants?
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Who was known for his famous "oil-drop" experiments to determine the charge of the electron?
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What is the name for a tool that makes work easier to do?
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