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.
This is a list of United States states by elevation. Elevation means the height of something above sea level. The highest point in the U.S. is Mount McKinley at 20,320 feet (6,194 m) above sea level. The lowest point on land in the U.S. is Badwater in Death Valley at 282 feet (86 m) below sea level.