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Repeat photography of the glaciers , such as the pictures taken of Grinnell Glacier between 1938 and 2009 as shown , help to provide visual confirmation of the extent of glacier retreat .
 location: Grinnell Glacier
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 location: Grinnell Glacier