The Rainbow Mountains in China's Danxia Landform Geological Park are truly a sight to behold. Looking at this majestic mountain range, it is hard to believe that the image is not digitally altered. Over the course of 24 million years, different colored layers of sandstone and other minerals were pressed together to form distinctive ribbons of color. Thousands of years of rain and wind have carved out the beautiful, technicolor landscape seen today.
It seems that the day when the Earth decided to create this landscape, it was celebrating a party. Or perhaps the person in charge of designing the simple slopes of a remote region, to the north of what would be China, had planned to amaze visitors with something exceptional.
In any case, it joined together all the rock layers of colors imaginable in one place, specifically in the area known as Zhangye Danxia, thus achieving what is perhaps the greatest gathering of different pigments in natural stone in the world:
Taken from :https://www.google.co.za/?gws_rd=ssl#q=rainbow+mountains+wiki