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.
A variety of oxygen-delivery devices are available for administering oxygen therapy. Which device to use often depends on the degree of hypoxia the patient is experiencing and any underlying respiratory diseases, such as chronic obstructive pulmonary disease (COPD).