穆斯塔法的天空弥漫着令人窒息的黑云,其主要成分为灰烬、烟雾与火山灰。
tephra is any fragmented material produced by a volcanic eruption, be it ash or rock.无论是灰烬还是岩石,所有因火山爆发而形成的碎片状物质都称作火山灰。
The ledge was covered with heavy ash, called tephra, and speckled with droplets of volcanic glass and delicate lava threads known as Pele's hair.岩架上覆盖了厚厚的火山灰烬,其间点缀着火山玻璃珠和被称之为火山毛(Pele ' s hair)的熔岩细线。