![]() The remaining 1% has water vapour as a component. Composition of airĬarbon dioxide and other gases cover up 0.03% of the atmosphere. However the presence of oxygen enhances human lives. Considerable amounts of changes in the oxygen levels have been observed with fluctuations between 30% back in the day but now it is 20%. This oxygen later became very important for life and other metallic oxidation processes. Before this there was no presence of oxygen in the composition of air. The third atmosphere saw the great oxygenation event which took place 2.4 billion years ago. Evidence of the process is found in fossils. After the ice Age cyanobacteria were seen which led to the Great Oxygenation event. ![]() Apart from the ice Age 2.4 billion years ago the earth had a warm climatic condition. It was a stable atmospheric condition back then. The second atmosphere saw its majority portion being captured by nitrogen. Sediments dating back to 3.8 billion years state that carbon dioxide was mixed with water and it reacts with other metals and for me crystal formations of carbonates. This atmosphere had nitrogen, carbon dioxide and many rare gases. The first atmosphere had hydrogen and its hydrides like water vapour, methane and ammonia as the composition of air.Īfter the eruption of volcanoes and the crashing of asteroids a new atmosphere was formed with a new composition of air. The presence of gases in the atmosphere also regulates the earth’s temperature. Secondly, it also absorbs the harmful UV rays of the sun which can cause various diseases. The atmosphere is important for us in many ways, it helps in creating the necessary pressure around the earth which leads to water and its existence in liquid form.
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