名词
中文翻译：火山灰
同义词：
['volcanic ash', 'volcaniclast例句：1. The ignimbrite layer is a unique geological feature found in many active volcanoes.（这种火山灰层是许多活火山中特有的地质特征。）']
例句：
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1. The ignimbrite layer is a unique geological feature found in many active volcanoes.
这种火山灰层是许多活火山中特有的地质特征。
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2. The ignimbrite formations are often used as building materials due to their durability and strength.
由于其耐用性和强度，这种火山灰沉积物常被用作建筑材料。
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3.The ignimbrite layers have been dated back millions of years, providing insight into the history of the Earth's crust.
这些火山灰层被追溯到数百万年前，为地球地壳的历史提供了见解。