pyroclastic

/pahy-ruh-klas-tik/US // ˌpaɪ rəˈklæs tɪk //UK // (ˌpaɪrəʊˈklæstɪk) //

火成岩,火山碎屑,火成碎屑,火成碎石

Definitions

adj.形容词 adjective

1
Geology.
- : composed chiefly of fragments of volcanic origin, as agglomerate, tuff, and certain other rocks; volcaniclastic.

Perhaps the scariest consequence of an eruption is a combination of all of the above in a phenomenon known as pyroclastic flow, a fast-moving mix of lava, rock, ash, and toxic gas.
Since then, dozens of more explosions have followed, generating devastating pyroclastic flows.
When volcanoes erupt, gases blast from the earth in fast-moving pyroclastic flows destroying everything in their path.
Much pyroclastic rock and some lava flows are intercalated amongst the Welsh Cambrian sediments.
Fast-moving deadly pyroclastic flows (“nuées ardentes”) are also commonly associated with plinian eruptions.