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This website is a government site, so it is a public domain and provides all resources including photos, videos, animations and podcasts for free to the public. The acronym USGS stands for United States Geological Survey, which means the photos and resources on this site pertain to elements of the geologic structure in the U.S. This site would be useful for all audiences of school age in grades 4-12. I chose that range because with the real-life depictions of our country's geography, it could easily bore and audience that was any younger. They are excellent quality resources and precise photography at our disposal for nothing out of pocket.