30,000 – 35,000 ft: Commercial airlines 29,035 ft: Mount Everest – Earth’s highest point 26,000 ft: Death Zone – Oxygen levels insufficient to sustain human life 22,595 ft: Ojos del Salada – Highest active volcano 18,000 ft: High clouds (Cirrus …
Read More »![](https://www.barnorama.com/wp-content/uploads/2015/06/0129-630x330.jpg)