Two examples from history support the hypothesis that rivers’ silt is high in nutrients.
First, the Ancient Egyptians were in large part successful because they had fertile soil in which to grow crops. We can assume that fertile soil is soil that is high in nutrients. Silt deposits from the Nile River gave the Egyptians their fertile soil.
Second, the Mississippi River’s silt deposits have contributed mightily to the New Orleans delta, giving this delta a network of swampy wetlands and barrier islands. These features, especially the wetlands, must have needed nutrients to come about.
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