Air
Oxygen on Earth. H 2 O (oceans) O 2 , CO 2 (atmosphere) CO 3 (rocks, coral, seashells) SiO 2 , silicates (sand, clay, rocks). Oxygen Content. Earth Crust. Air. Made commercially by fractional distillation of air (b.p. = 90K). ALLOTROPES OF OXYGEN. O 2 Paramagnetic (why?)
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