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obsidian
常考释义
Historians have discovered that a type of natural glass — obsidian — formed in places such as the mouth of a volcano as a result of the intense heat of an eruption melting sand — was first used as tips for spears.
史学家发现了有一种天然玻璃-黑曜石,由于极高温熔岩的喷发,往往形成于火山口-它最开始被用来作箭簇。
来源于:剑雅12-TEST8n. 黑曜岩【地质】
Obsidian is a kind of black glass formed when the heat of a volcano melts the silica material in sand.
黑曜石是火山的热将沙子中的二氧化硅材料融化时形成一种黑色的玻璃材料。
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