What chemical elements are the atmospheres of Earth, Venus and Mars composed of?

The Earth’s atmosphere contains 78% nitrogen, 20.9% oxygen, 0.9% argon, 0.03% carbon dioxide. Venus, like Earth, has a dense atmosphere. It contains carbon dioxide (about 97%), nitrogen (about 3%), water vapor (less than 0.1%), some impurities, for example, CO, HC1. Mapc has a highly rarefied atmosphere, which is mainly composed of carbon dioxide (95%), nitrogen (about 3%) and other gases such as oxygen (0.15%).

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