???

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Aug 06th 2011 15:00
I can't understand this sentence at all.
It is a excerpt of the listening section of Toefl pre-test.

"Uh, other things that glaciers can do is, uh, as they retreat, instead of depositing some till, uh, scraped up soil, in the area, they might leave a big ice block and it breaks off and as the ice block melts it leaves a dpression which can become a lake."

Please tell me!!
It's Greek to me. XO