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U.S. Geological Survey

11 minutes 37 seconds
Grade Level: 7 - 12
4 minutes 50 seconds
Grade Level: 7 - 12
7 minutes 33 seconds
Grade Level: 9 - 12
30 minutes 59 seconds
Grade Level: 10 - 12
12 minutes 9 seconds
Grade Level: 11 - 12
3 minutes 34 seconds
Grade Level: 6 - 12
8 minutes 11 seconds
Grade Level: 7 - 12
5 minutes 4 seconds
Grade Level: 7 - 12
11 minutes 45 seconds
Grade Level: 7 - 12
6 minutes 44 seconds
Grade Level: 11 - 12
3 minutes 29 seconds
Grade Level: 9 - 12