- A river changes its flow pattern as it goes downstream.
- The water discharge of the river going downstream increases because the tributaries (streams, smaller rivers) join in to form a massive river that can range from a few feet to miles wide.
- The efficiency of the river flow decreases because the water from other sources join in, thus mixing in pollution and other fishes that thrive the area.
- The friction of the water increases because of the movement of the water that joins together, thus producing more current and energy for the water to flow downstream.
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