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.
James A. Bushnell, a pioneer of Lane county, died at his home here April 8th. Mr. Bushnell was born July 27, 1826, in Cattaraugas county, New York. He married in 1849 and located in Missouri. In 1852 he crossed the plains to Oregon and spent the first winter in the gold mines of California.