What is the approximate altitude range of the homosphere?

The homosphere is characterized as the region of the Earth's atmosphere where the composition of gases is relatively uniform due to the mixing of atmospheric constituents. This layer extends from the surface of the Earth up to about 100 kilometers in altitude. Within this range, the concentrations of major atmospheric gases such as nitrogen and oxygen remain fairly consistent, which is why it is often highlighted in studies pertaining to meteorology and atmospheric science.

Above this threshold, in regions like the heterosphere, the composition of gases varies significantly with altitude, as lighter gases become more prevalent at higher altitudes. The transition between the homosphere and the heterosphere occurs around the 100-kilometer mark, making this range a critical part of atmospheric studies and understanding air travel, weather patterns, and environmental science. Therefore, the correct choice of 100 kilometers accurately reflects the upper limit of the homosphere.