T1R1O1P3O1S1P3H4E1R1E1
18 points
TROPOSPHERE is validvalid
[n TROPOSPHERES]
a region of the atmosphere from 25,000 feet to 55,000 feet, the boundary between the upper troposphere and the lower stratosphere [n -S]
[n TROPOSPHERES]
a region of the atmosphere from 25,000 feet to 55,000 feet, the boundary between the upper troposphere and the lower stratosphere [n -S]