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| What are gamma rays used for? | |
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| Gamma rays are used in the medical field to kill cancer cells and make pictures of the brain, and in industrial situations as an inspection tool. | |
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| What is the greenhouse effect? | |
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| The greenhouse effect is the rise in temperature that the Earth experiences because certain gases in the atmosphere trap energy from the sun. | |
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| Is the greenhouse effect always harmful? | |
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| No. The greenhouse effect is responsible for keeping temperatures within the limits that can sustain life. | |
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