Module 4 - Video Credits

All photos, animations, and video segments are in the public domain and were obtained from the following sources:

• Hurricane Rita, NASA/Goddard Space Flight Center, Scientific Visualization Studio, Public Domain.
• Sand in an hourglass and inventions from Fashion Favorites_1, Caravel Films, Inc., Video Archive, Public Domain
• Ice on the polar caps, northice.mpg, NASA/Goddard Space Flight Center, Scientific Visualization Studio, Public Domain
  
• Dirt pile, ImageID=2010197, U.S. Department of Energy, Public Domain
• Hoover Dam, ImageID=2016726, U.S. Department of Energy, Public Domain
• Water Cycle, Id=10016, NASA/Goddard Space Flight Center Conceptual Image Lab, Public Domain