What causes earthquakes? Earth's crust ranges from 3 to 45 miles deep (5 to 70 kilometers). The crust is a thin, hard shell that floats on the denser, hotter rock of the mantle.
Sponsored Topics. Airway Heights is a city in Spokane County, Washington, United States, just west of Spokane. The population was 6,114 at the 2010 census. The city's name was taken from its close proximity to Fairchild Air Force Base and Spokane International Airport. Airway Heights was officially incorporated on June 28, 1955.
According to the U.S. Census Bureau, the county has a total area of 1,806 square miles (4,680 km 2), of which 1,670 square miles (4,300 km 2) is land and 137 square miles (350 km 2) (7.6%) is water. The highest natural point in Washington, Mount Rainier at 14,410 feet (4,392 m), is located in Pierce County.