well, by rotating the fields, the farmers give the soil a chance to naturally restore nitrogen and other nutrients.
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your question is... How did the Earth`s atmosphere change composotion to became today`s nitrogen and oxygen atmosphere? Answer: it happend with the help of solar untraviolet (uv) radiation,the very thing what we worry about now for its cancer-causing ability
The world learned it must work together to maintain peace, restore devastated countries, help those in need, restore global trade and they formed the United Nations to promote global communication and prevent future world wars. It discovered that isolationism was too idealistic. The Cold War forced the situtation anyway.
Earthworms do not have jaws. They suck their nutrition through their mouth by the help on the pharynx and this food is churned in the gizzard after passing trough the esophagus and or being stored in the crop.
The opening up of passageways through the soil and the leaving of nutrient rich organic matter are two ways in which earthworms improve garden health. The passages that they open in their movements through soil encourage the presence of air and water pore spaces. Pore spaces encourage appropriate levels of air and moisture below ground. They thereby discourage compaction and erosion.The matter that earthworms leave in soil comes in the form of droppings. These droppings are high in such important nutrients as nitrogen. Plants only can take nitrogen in soluble form. Nitrogen that otherwise is unavailable to plants becomes available once it passes through and out of earthworm.
Earth rotates on its axis and it revolves around the sun. Both things conserve earth's angular momentum. Each rotation is a day, and each solar revolution is a year. The days and years both help us mark the passage of time. Other than that, there are not too many similarities.