Using the points and examples from the lecture, describe the two kinds of rock formation in a cavern, and explain how the professor helps his students remember the difference between two.

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Using the points and examples from the lecture, describe the two kinds of rock formation in a cavern, and explain how the professor helps his students remember the difference between two.

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2013-09-30 hossein021 70.00 Check this speaking
2014-01-29 nishith 80.00 Check this speaking
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