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.
One important point is to make sure that the COPD is well treated before oxygen is started. For example up to 21% of patients who have a low oxygen in the range you mention, may improve if their COPD treatment is expanded, such that they would no longer need oxygen.