caption: Turbidity is water clarity Materials suspended in water can make it look dirty or turbid. Examples include: silt, soil, or sand grains plankton: plants (phytoplankton) and animals (zooplankton ) that drift in the water column detritus: small pieces of dead plant material that are food for some creatures Even salt where it meets the freshwater can add to the river's turbidity But, water that is not clear may or may not be dirty.
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