Painted Desert, USA
The Painted Desert is an area of multicolored desert stretching along the Colorado River from the Grand Canyon to Petrified Forest National Park.
The deep ravines, dug by winds and rain, took on a rounded shape after the topsoil was washed away. They are coloured in wonderful tones, due to the different mineral composition of the sedimentary rocks. When the deposition process is slow, oxides of aluminium and iron predominate, giving the rock an orange, red and pink hue. When deposition is faster, oxygen deficiency results in blue, lavender and grey tones. Especially at sunset, the beauty is extraordinary.