Oxygen, a gas in the air, atmosphere, the air around the earth, algae, plants with no roots or leaves that grown in water, hemisphere, the northern or southern half of the earth, rock, a hard material that is formed by minerals, particle, a very small piece of somehting, ice sheet, a large, thin, flat area of frozen water, chemical, a substance used in or produced by chemistry, nitrogen, a gas in the air symbol N, bacteria, an organism with only one cell

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