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  3. Volcanoes A volcano is an opening in a planet’s surface or crust, / which allows lava, ash and gases to escape from the p

Volcanoes A volcano is an opening in a planet’s surface or crust, / which allows lava, ash and gases to escape from the p

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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. /
解析                                                                       火山
       火山是地壳的一个开口，让熔岩、灰烬和气体从地表下面溢出来。它是地球内部巨大力量在作用的剧烈表现。火山常见于板块分离或聚集之处。火山爆发会有很多危害。然而，火山也会给土壤添加有营养的物质，为许多农作物创造完美的条件。
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