…All of these are coarse-grained rocks. Other igneous rocks not included in Table 1 include pyroclastic rocks. Pyroclastic rocks are a general term for rocks formed by the solidification of volcanic bombs, volcanic blocks, pumice, scoria, volcanic lapilli, and volcanic ash emitted from volcanoes. … *Some of the terminology that mentions "pyroclastic rocks" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…これらはいずれも粗粒な岩石である。 表1に含まれていない火成岩として,そのほかに火山砕屑岩類pyroclastic rocksがある。火山砕屑岩は,火山から放出される火山弾,火山岩塊,軽石,スコリア,火山礫,火山灰などが集まって固結して生じた岩石の総称である。… ※「pyroclastic rocks」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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