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tephra
US
・
UK
A1 初級
n. (u.)
不可數名詞
火山碎屑
影片字幕
如何對火山進行分類 (How to Classify Volcanoes)
06:52
A volcano is a cone shaped hill or mountain created by the eruption of magma in the form of lava,
tephra
and other debris.
and are characterized by the production of a mix of
tephra
and thick, viscous lava.
B2 中高級
您无需担心黄石（You Don’t Need to Worry About Yellowstone (or Any Other Supervolcano)）
13:37
This is a scale that categorizes volcanoes by how much
tephra
they spew out —
tephra
1.3 cubic kilometers of
tephra
.
B1 中級
