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.
Some people with COPD only develop low oxygen levels during exercise or sometimes during sleep. In such cases, oxygen can be prescribed for use just during those particular situations. COPD patients with right-sided heart failure, or with particularly high red blood cell counts, may also benefit from oxygen therapy.