The Grand Canyon of the Yellow

<br>The canyon varies from 800 to 1200 feet in depth and from 1500 to 4000 feet in width. Its length is about 24 miles. The upper 2&#189; miles is the most colorful section. Hot spring activity has continued through the ages altering the lava rock to produce lovely colors which are largely due to varied iron compounds. Have you noticed that stream vents and geysers are still at work on the canyon walls?