The driving force in this chapter is erosion. Areas exposed to the action of wa-ter, wind, and glaciers over millions of years receive deep scars in the form of canyons. This is how nature created the greatest of them all, the Grand Canyon in the United States. The quality of a given rock layer and different regimes of wind and water give rise to so-called hoodoos, which are turret-like formations of sedimentary rock, as well as to arches, narrow slot canyons, as well as other structures. In the United States, Utah’s Bryce Canyon is a model of the perfect coordination between rock and erosion. Hundreds of fire-red hoodoos overtop one another in successive rows along the semicircular canyon rim. In 2011, after numerous journeys in the American southwest, I had the utterly infrequent honor of photographing Bryce mantled in fresh snow after several days of blizzard conditions. But Bryce Canyon isn’t the only place to exhibit hoodoos. Across the entire Colorado Plateau, there may be thousands of spots like this, of which several have already been declared as national parks. The rock layers are the books of bygone eras. Geologists read them like others read novels, and we photographers record their appearances for posterity.