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英语翻译Volcanoes have been erupting on the earth for millions o

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英语翻译
Volcanoes have been erupting on the earth for millions of years.More than five hundred ones still erupt today.These are called acrive volcanoes.Volocanoes are located in belts or chains.They are found where the earth's crust is weak.The weak spots let the hot rock escape when the volcano erupts.Many volcano belts are mountain ranges along the edges of continents.One belt runs along the western coast of South America up through the westrenpart of the United States Other volcanoes are found in ocean basins.about three-fifths of all active volcanes inthe world are in the Pacific Ocean.Many of these volcanoes erupt under the water.The Hawaiian Islands were built by volcanoes that brgan erupting under water and finally reached the surface of the ocean.要人工翻译!逐句的!
火山在地球上已经喷发了几百万年.至今还有超过500个的仍在喷发.他们被称作活火山.火山处在belts(火山带)或者chains(山脉群).火山被发现于地壳薄弱的地方.当火山喷发时,这些薄弱地点让热岩石(岩浆)喷出.很多火山带都处在大陆边缘的山脉.有一个火山带从南美洲西海岸向上延伸穿过美国的西部.其他火山被发现于海盆之中.实际上大约有3/5的活火山是在太平洋.他们中的很多在水下喷发.夏威夷群岛就是火山造就的,这些火山最开始是在水下喷发,最后到了洋面.