In rivers and streams what causes sediment

"Sediment can come from soil erosion or from the decomposition of plants and animals. Wind, water and ice help carry these particles to rivers, lakes and streams"

Here's a link for more info: https://cfpub.epa.gov/npstbx/files/ksmo_sediment.pdf

Hope this helps! 

The infrared (ir) and the ultraviolet(uv) represent the two extremities of the visible spectrum (400-700nm). while ir represents electromagnetic radiation with wavelengths longer than those of visible light, uv represents wavelengths shorter than visible light