Rising 1,267 feet (386 m) above the meandering Belle Fourche River, Devils Tower is a cluster of rock columns in the Black Hills of Wyoming formed by the cooling and crystallization of molten matter. The site, which many Native American Plains tribes consider sacred, was declared the first US National Monument by President Theodore Roosevelt in 1906. A popular rock-climbing site, the monument attracts some 400,000 visitors each year. Why do most climbers abstain from scaling the tower in June? Discuss