It is the lowest layer of the atmosphere and is close to Earth. It means the sphere that spins or spins. Layer that moves.
It starts from the atmosphere closest to the earth, up to 12 km that makes up the homosphere. From Greek 964; 961; 959; 960; 959; 962; (tropes "turn, movement") 963; 966; 945; 953; 961; 945; (sphaira "sphere") . See stratosphere, mesosphere.