Why Are the Vermilion Cliffs So Red?
By Laura Geggel, Senior Writer | June 10, 2017 08:28am ET
If you've ever visited the Grand Canyon, Arizona's Vermillion Cliffs or the astonishingly rainbow-colored hills of China's Zhangye National Geopark, you likely noticed they have one thing in common: red-colored rocks.
How did these rocks get so red? The answer involves iron, which bonds with other elements to form minerals famous for their red, rusty hue.
https://www.livescience.com/59440-how-red-rocks-got-that-way.html