Depending on the area seen in an individual picture, brown, yellow and green continents can be seen or parts of Earth can be covered by white clouds. Earth is by far the most dynamic planet when seen from space.
Oxygen therapy is a medical treatment. It must be prescribed by a doctor. For people with COPD, oxygen therapy can be a helpful part of their treatment plan. The prescription your doctor writes will include: If you need oxygen for rest, exercise and/or sleep, and how much in liters per minute (lpm) for each activity.
The level of oxygen in airplanes is about the same as the oxygen level at an elevation of 8000 ft (2400 m). This drop in oxygen can really affect people with COPD. If you normally use oxygen or have borderline-low oxygen levels in your blood, you may need oxygen when you fly.