Obsidian is (formed) (when) siliceous lava (cools) too rapidly to (crystallized)

游客2024-01-05 92

问题 Obsidian is (formed) (when) siliceous lava (cools) too rapidly to (crystallized) into rock-fanning minerals.

选项 A、formed
B、when
C、cools
D、crystallized

答案 D

解析

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