The stratosphere, mesosphere and lowest part of the thermosphere are collectively referred to as the middle atmosphere, which spans heights from approximately 10 kilometres (33,000 ft) to 100 kilometres (62 mi).
Terrell, Texas. Not to be confused with Terrell County, Texas. Terrell is a city in Kaufman County, Texas, United States. As of the 2010 census, the city population was 15,816. Terrell is located 32 miles (51 km) east of Dallas.
SOMERVELL COUNTY. Somervell County is in north central Texas and is bisected by U.S. Highway 67 and State Highway 144. It comprises 188 square miles, the second-smallest area among Texas counties. Glen Rose, the principal town and county seat, is fifty-five miles southwest of Fort Worth.