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  3. [audioFiles]2017m5s/audio_ezfj_186_201705[/audioFiles] Volcanoes A volca

[audioFiles]2017m5s/audio_ezfj_186_201705[/audioFiles] Volcanoes A volca

游客2023-10-30  40
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答案     Volcanoes
    A volcano is an opening in a planet’s surface or crust, / which allows lava, ash and gases to escape from the place below the surface. / It is dramatic evidence of the powerful forces at work inside the Earth. / Volcanoes are generally found where plates are moving apart or coming together. / Erupting volcanoes can pose many hazards. / And the most deadly volcanoes are usually those tall and conical ones / built up by many layers of eruptive materials. / They can destroy entire cities and kill large numbers of people. / Nevertheless, volcanoes also add nutritious substances to soils, / creating perfect conditions for many crops. /
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