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 study performed in Australia randomly assigned 405 patients with acute exacerbations of COPD to receive oxygen by nasal prongs at either 8-10 L/min (high-flow) or by a flow rate that was titrated to increase the arterial oxygen saturation just to 88%-92% (titrated flow).