Science

What tool uses a magnetic needle that points north?

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Deep trenches such as the Grand Canyon were formed by what process?
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Which of these properties is true for all matter?
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How many astronauts walked on the moon before 1970?
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An isogeotherm is an imaginary line connecting points of equal temperature where?
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What does the scientific acronym BTU stand for?
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Which planet's orbit is the most circular?
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What is the sticky bacteria that forms on teeth and gums?
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Who was the last person to set foot on the moon in 1972?
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