consisting of mainly carbon dioxide with little or no oxygen gas. Volcanoes also produced nitrogen which gradually built up in the atmosphere and there may have been small proportions of methane and ammonia. When the oceans formed, carbon dioxide dissolved in the and carbonates were precipitated producing sediments, reducing the amount of carbon dioxide in the atmosphere. 4.9.1.3 Algae and plants produced WS 1.2 0.5 Extended writing: explain Show that aquatic plants the oxygen that is now in the how algae and plants (eg Elodea) produce atmosphere by have caused the oxygen in daylight. photosynthesis, which can concentrations of oxygen be represented by the in the atmosphere to equation: increase.
consisting of mainly carbon dioxide with little or no oxygen gas. Volcanoes also produced nitrogen which gradually built up in the atmosphere and there may have been small proportions of methane and ammonia. When the oceans formed, carbon dioxide dissolved in the and carbonates were precipitated producing sediments, reducing the amount of carbon dioxide in the atmosphere. 4.9.1.3 Algae and plants produced the oxygen that is now in the atmosphere by photosynthesis, which can be represented by the equation: WS 1.2 0.5 Extended writing: explain how algae and plants have caused the concentrations of oxygen in the atmosphere to increase. Show that aquatic plants (eg Elodea) produce oxygen in daylight.