Differences in the age of the river, the amount of water that flows through it, the soil or rock it’s flowing over. As a general rules, deeper rivers have been flowing longer and with more, faster-moving water, across more erodible substrates. The water slowly digs out a channel over time. Some are barely cut into the ground because they’re new, or don’t have much flow, or move very slowly, or are on a type of rock that’s very resistant to erosion. There are quite a few factors at play here, but these are a few that help explain the great variation we see in rivers.
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