Tuberculosis (TB) Tuberculosis (TB) Active tuberculosis (TB) is very contagious. The World Health Organization (WHO) estimates that one-third of the world's population is infected with the bacteria that cause TB.
With an average elevation of 6,800 feet, Colorado is the highest state in the United States. A mountain lake outside of the skiers dreamland of Aspen, Colorado. The US is bordered to the north by Canada and Mexico to the South. With 50 states of varied sizes, US is considered the largest nation in America.
Thirteeners: 13,000-Plus Feet. Arapahoe Basin Ski Resort has a top elevation of 13,050 feet in Dillon, Colorado. The resort offers the highest ski slopes in the United States. Loveland Ski Area features a summit elevation of 13,010 feet in Georgetown, Colorado. Breckenridge Ski Resort has a top elevation of 12,998 feet.