The Control of Nature Themes

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Solid Earth Flows

An irony in the expression on solid ground is that forming solid ground requires a liquid. The Mississippi River carries silt and sediment that it deposits in its riverbed. The riverbed builds up over time. The river forms levees and leaves new soil when it overflows its banks. Centuries of depositing this watery residue forms the Louisiana delta and New Orleans land mass. Flooding enables the sedimentation process to add solid land mass to the area. Water that flows downriver from the north begins as solid ice and snow in the far northern Mississippi. Solid ice and snow melts into watery flows that hold sediment. The sediment is carried south where it is deposited to become solid again. This water flow originates in a cold and hard form before melting into liquid. River water can carry the watery sediment south to become solid ground. The Corps'...

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This section contains 1,032 words
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