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Our transcription: The primary way that a river functions geologically is to transport not just water, but sediment down slope and toward the ocean. The faster a river flows, the more efficient this process becomes, so geologists are acutely interested in flow velocity. When the flow velocity of a stream is relatively high, the energy of the moving water is converted into processes that lift chunks of bedrock or sedimentary particles from the bottom and carry them downstream. This is known as "erosion", and there are three different erosional processes that operate in rivers.
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