Friday, February 08, 2008
This is the Grand Canyon of Yellowstone (not to be confused with the famous 'grand' Grand Canyon at Arizona). Over millions of years, the narrow Yellowstone river has carved out this canyon from the bowels of the earth. Notice the red tinge on the canyon walls - this is because the canyon wall has 'rusted'! Rust is iron oxide (chemistry, anyone?) - and that is exactly what the rocks in the canyon walls are made of.