Plants - Needed to decrease CO2 and increase O2, Cooling - Needed for water vapour to cool and fall as rain, Soluble - Gases that dissolve in water are this, Oceans - Formed after Earth cooled, needed for plants to evolve, Nitrogen - Unreactive gas, released by volcanoes, still in our atmosphere today, Ammonia and methane - Released by volcanoes in small volumes, Photosynthesis - Process that decreases CO2 and increases O2, Carbon dioxide - High in Earth's early atmosphere, decreased by dissolving in oceans and being used for photosynthesis, Oxygen - Waste product of photosynthesis by plants, Molten - Liquid surface of early Earth that was extremely hot, Volcanoes - Source of gases in Earth's early atmosphere,

Practice task - Earth's atmosphere development

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