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.
2 dead, 1 injured in gruesome Martin County stabbings; dramatic 911 call released. Suspect ID'd as FSU student; 911 call released. MARTIN COUNTY, Fla. - A 19-year-old Florida State University student is accused of killing a Martin County couple in a random, violent and unprovoked attack Monday night, according to the Martin County Sheriffâs Office.