noun ダウンロード 🔗共有 軽石 A light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into water or air as a froth containing masses of gas bubbles. As the lava solidifies, the bubbles are frozen into the rock. Examples : "The geologist carefully examined the piece of pumice, noticing its light weight and many tiny holes. " 地質学者は軽石の破片を注意深く調べ、その軽さと多くの小さな穴に気づいた。 geology material substance nature science AIとチャット語彙ゲーム読解練習
verb ダウンロード 🔗共有 軽石で磨く To abrade or roughen with pumice. Examples : "She used a pumice stone to pumice the calluses on her feet. " 彼女は軽石を使って足の角質を磨いた。 material geology action AIとチャット語彙ゲーム読解練習