When the molten rock of the earth’s core forced its way to the surface to form the throat of a volcano, as the centuries passed, the rock cooled and hardened, shrinkingand cracking into long columns.
出自-2016年12月听力原文
When the molten rock of the earth's core forced its way to the surface to form the throat of a volcano, as the centuries passed, the rock cooled and hardened, shrinking and cracking into long columns.
2016年12月六级真题（第二套）听力 Section B
柯林斯高阶英汉双解学习词典释义
ADJ
熔化的;熔融的
Molten rock, metal, or glass has been heated to a very high temperature and has become a hot thick liquid.