However, the most frequent causes of turbidity in rivers and other waterbodies are algae and inorganic material from soil, weathering, and erosion.
(the most frequent causes of turbidity in rivers and other waterbodies; are; algae and inorganic material from soil, weathering, and erosion)
the most frequent causes of turbidity in rivers and other waterbodies
are
algae and inorganic material from soil, weathering, and erosion