Which of the following factors affects visibility?

• A. Bottom composition
• B. Season
• C. Water movement
• D. All of the above

Answer: (D)

Visibility underwater depends on how much material is suspended and how water movement moves those particles. Bottom composition matters because muddy or fine-sediment bottoms are easily stirred up by movement or contact, creating turbidity that scatters light and reduces how far you can see. Season affects visibility through changes in plankton, algae, and runoff—some times of year bring more particles into the water, while calmer periods may be clearer. Water movement, including currents, tides, and surge, constantly mixes and transports particles, which can quickly change clarity. Since any of these factors can increase suspended matter or move it around, all of them influence how well you can see underwater.