WEBVTT

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Not every deposit
survives long enough to become rock.

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Sometimes one sedimentary deposit
will get recycled

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or broken up into pieces
that are deposited again in a new setting.

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Here we see a modern river that passes
through an ancient glacial valley.

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The valley was once
full of glacial till deposits.

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Today, the river breaks up
those till deposits,

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moves them downstream, and
then redeposits them as river sediments.