Final answer:
When a river's velocity slows from 100 to 50 centimeters per second, more particles will be deposited at that point in the river.
Step-by-step explanation:
When a river's velocity slows from 100 to 50 centimeters per second at a point in its channel, it indicates a decrease in the speed of the water flow.
This decrease in velocity affects the transport and deposition of particles in the river.
At higher velocities, the water can carry larger and heavier particles, causing more erosion and transport of sediment.
As the velocity slows down, the water loses its ability to carry these particles, resulting in deposition.
This deposition occurs because the river has less energy to suspend and transport the sediment.
Therefore, when the river's velocity slows from 100 to 50 centimeters per second, more particles will be deposited at that point in the river.