A pyroclastic rock fragment; (also) a pyroclastic rock. Cf. pyroclastic, n.
| 单词 | θ5731 |
| 释义 | the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > volcaniclastic > fragment (1) pyroclast1920 A pyroclastic rock fragment; (also) a pyroclastic rock. Cf. pyroclastic, n. |
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