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1 All About Elements: Oxygen http://boreal.com boreal.com | 800-387-9393 2 3 Fun Facts About… Oxygen 1. Oxygen constitutes 21% of our atmosphere, nearly half the mass of the earth’s crust and about two thirds of the human body. It is the third mos...

wardsci.com 800.962.2660 Developing a purchasing plan and rigorously following the plan when ordering the school’s chemical supply will help safety, prevent waste and save money. The following may help your school make chemical purchases efficient...