1. Pitchstone is formed when lava rapidly cools and solidifies, resulting in a glassy rock.
(当熔岩迅速冷却并凝固时,就形成了玻璃质的pitchstone岩石。)
2. The pitchstone deposits in the area indicate past volcanic activity.
(该地区的pitchstone沉积物表明曾发生过火山活动。)
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