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Daily Archives: 2021-03-21

What element makes up 80% of the air?

What element makes up 80% of the air? Nitrogen comprises the greatest part of the atmosphere, at almost 80 percent by volume. Nitrogen is a colorless, odorless, tasteless gas that reacts very little with other substances. The atmosphere also contains oxygen, at about 20 percent. What gas makes up 20 of the Earth’s atmosphere? By […]

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What are the stages of evolution of the atmosphere?

What are the stages of evolution of the atmosphere? Earlier in the course we learned that the evolution of the atmosphere could be divided into four separate stages: Origin. Chemical/ pre-biological era. Microbial era, and. Why do planes do not fly over the Pacific? Airplanes often avoid air paths that take them over Mt Everest […]

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