Hourly Forecast Detailed. 1  0am:The Santee, SC forecast for Apr 11 is 63 degrees and Clear. There is 74 percentage chance of rain and 4 mph winds from the South-Southeast. 2  3am:The Santee, SC forecast for Apr 11 is 55 degrees and Clear. There is 79 percentage chance of rain and 4 mph winds from the South.
Most Important Organism? Marine plants produce between 70 and 80 percent of the oxygen in the atmosphere.
How much oxygen will there be at Mount Everest? Contrary to popular belief, the percentage of oxygen in the air doesn t change significantly with altitude up to about 85km from the earth! At sea level, oxygen comprises approximately 23% the air by weight and on the summit of Mount Everest it still comprises 23% of the air.