72538
Sections of the Missouri River floodplain taken by the United States Geological Survey show a great variety of material of varying coarseness , the stream bed having been scoured at one place and filled at another by currents and floods of varying swiftness , so that sometimes the deposits are of coarse gravel , sometimes of fine sand or of fine silt .
 Missouri River, United States Geological Survey
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Missouri River, United States Geological Survey