Courtesy of USGS Science for a changing world
Some people think the pyramids, at Giza in Egypt, were made by building, then removing a giant artificial hill. Disturbed sand comes up as a lighter colour.
- Reduce the image of the pyramids to 16 colours.
- Look for light regions and consider where would be the most logical place to put an artificial hill.
- Test to see if there is any evidence of a large