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I can't get a dialling tone buy erectimax online Unlike the lung power and vocal chords that give a child's scream its energy, the volcano's scream comes from its harmonic tremor. According to Diana Roman, a volcanologist at the Carnegie Institution of Washington, you can think of the tremor as a series of really weak earthquakes. "A single earthquake lasts only for a few seconds, but tremors can last minutes," she told ABC News.
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