The lowest part of the troposphere, where friction with the Earth's surface influences air flow, is the planetary boundary layer. This layer is typically a few hundred meters to 2 km (1.2 mi) deep depending on the landform and time of day.he troposphere is the lowest portion of Earth's atmosphere. It contains approximately 75% of the atmosphere 's mass and 99% of its water vapor and aerosols.
Bushnell is a city in Sumter County, Florida, United States. The population was 2,050 at the 2000 census. According to the U.S Census estimates of 2005, the city had a population of 2,119. It is the county seat of Sumter County.
Marion News. 1  Marion County man cited over venomous cobra's escape. 2  Child riding bike in Ocala struck by vehicle. 3  Plane crash at Williston Airport kills 4 on Easter Sunday.  Florida Forest Service's interactive fire 1  map. Florida Forest Service's interactive fire 2  map. Florida Forest Service's interactive fire  map.