This activity takes about 25 minutes: 15 minutes to set up the apparatus plus another 10 minutes for observation. A simple experiment on photosynthesis and oxygen production allows us to visualize the production of this gas by aquatic plants. Since then, nearly half of the atmosphere’s oxygen has come from the ocean. The subsequent formation of the ozone layer, through the action of UV rays on atmospheric oxygen, made it possible for the living organisms to colonize land. The primordial atmosphere did not contain oxygen until the appearance of photosynthesis in marine microorganisms, which first began to produce oxygen that later diffused into the atmosphere. OL principle 4 – The ocean makes Earth habitable This influence may be hard to grasp when living far from coastal areas, but you can use the simple classroom activities presented in this article (OL principles 4–7) and in the previous one (OL principles 1–3) to help students understand the importance of the ocean.
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