A pyroclastic cone formed when pumice piled up around the crater. It was formed mainly by eruption of andesite and rhyolite lava. Source: About Shogakukan Digital Daijisen Information | Legend |
軽石が火口の周りに降り積もってできた火砕丘。主に安山岩や流紋岩の溶岩による噴火活動によって形成される。
出典 小学館デジタル大辞泉について 情報 | 凡例 |
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