Effusive rock

Japanese: effusive rock(英語表記)effusiverock
Effusive rock

…Lava is formed when magma erupts onto the earth's surface or the ocean floor and solidifies, and volcaniclastic rocks are formed when materials released during volcanic eruptions are solidified. The term effusive rock is sometimes used. There are various classification methods based on chemical composition, texture, mineral composition, color index, etc., but the most commonly used method is based on chemical composition, especially the content of SiO2 . …

*Some of the terminology that refers to "effusive rock" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…マグマが地表や海底に噴出,固化した溶岩,および火山の噴火の際に放出された物質が固化した火山砕屑岩からなる。噴出岩effusive rockという語が用いられることもある。化学組成,組織,鉱物組成,色指数などに基づくいろいろな分類方法があるが,一般的に用いられるのは化学組成,特にSiO2の含有量に基づいて分類する方法である。…

※「effusive rock」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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