You will hear a recording. Below is a transcription of the recording. Some words in the transcription differ from what the speaker said. Please click on the words that are different.
你将听到一段录音。下面是这段录音的文字稿，其中一些词与讲话者所说的不同。请点击那些不同的词。
A glacier looks motionless, but it flows downhill like extremely slow honey. Two mechanisms drive the movement: the ice itself deforms under its own pressure, and the whole mass can slide on a thin film of meltwater at its surface. Speeds vary enormously — from a few metres a year to several metres a week during a surge — and the fastest glaciers today are those whose bases are lubricated by increasing meltwater.
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