Earth’s Shakes and Quakes

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What is a synonym for the word penned in the first sentence?

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How does the author describe earthquakes here?

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Why are plate boundaries important?

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where does an earthquakes originate?

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What is an epicenter?

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What does a seismogram do?

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How are the first seismograph and the modern seismograph similar?

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What is the difference between an earthquake and an aftershock?

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How are earthquakes and tsunamis connected?