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Question I was asked: The telephone was invented in Boston by

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Which of the following causes a chemical change?

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Question generated: Which technology used to generate electrical power involves a trade-off between economical electricity and long-term waste disposal problems?

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Answer: Rocks found on Earth are classified as sedimentary, metamorphic, or igneous based on

question: Write a question you would see in a school textbook. OPTIONS:
- space probe.
- space shuttle.
- lunar module.
- natural satellite.
answer: In 1976, the Viking I Lander was sent to Mars to analyze atmospheric gases and soil samples. The Viking I Lander was most likely a

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Which action is the best method to separate a mixture of salt and water?