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molten

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definition: 
(Especially of materials with a high melting point, such as metal and glass) liquefied by heat.
sentence: 
A spectacular form of heat advection occurs when molten rock, or magma, erupts from a volcano. Solidification of the molten material into rocks happened as the Earth cooled.
difficulty: 
medium
toefl frequency: 
2
toefl classification: