- Footprints in the sand along the Colorado River in the Grand Canyon.
- Source: self-made
- Date: November 14, 2006
- Author: Gonzo fan2007
This image is a detail of an image copied from Wikimedia Commons
Please see the source page for license and all other information: Source page
Appears on these pages
Indicators simply measure or indicate what’s going on, and answer straightforward questions...