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.
Formed out of Thurston County in 1852 by the legislature of the Oregon Territory, it was named for U.S. President Franklin Pierce. The county has a total area of roughly 1,800 square miles, of which 1,670 square miles is land and 130 square miles is water. The highest natural point in Washington, Mount Rainier at 14,410 feet, is located in Pierce County. Local economy . The founding of Pierce County encouraged a slow but steady stream of new settlements. Tacoma was founded in 1872.