Sediment transport is controlled by submarine landslides, debris flows, turbidity currents, and contourites. Silt and clay contribute to turbidity in water. It has been extirpated in areas with excess turbidity and siltation in western Ohio. Hence, as phytoplankton begin to multiply more rapidly, turbidity in the river and gulf increases. Inorganic and organic particles contribute to the turbidity and color of water. Water pre-filtration is critical as water turbidity lowers UV-C penetration. The relative turbidity of the reacted sample quantifies the CYA concentration. Flow rates, turbulence, turbidity and temperature were other contributing factors. They are fairly tolerant of pollution, turbidity, and low oxygen content. Biologists would analyze subsequent impacts to aquatic flora and fauna from increases in water turbidity. The higher the cell concentration, the higher the turbidity. Polymer conformation of course affects many bulk properties (such as viscosity, turbidity, etc.). Using spectrophotometry for measuring the turbidity of cultures is known as turbidometry. Because of the lower turbidity of the water sunlight penetrates deeper in the Nile water. However, underwater mudflows are prevalent on submarine continental margins, where they may spawn turbidity currents.