- Describe the photo above. What man-made features do you notice?
- What type of energy is being produced in this image?
- What are a few ways that this land has been changed by humans?
- How can this image be used as evidence that humans modify their physical environments to provide energy?
"Hoover Dam, Circuits 1-15, U.S. Highway 93, Boulder City, Clark County, NV," Date Unknown. Courtesy of Library of Congress