Earth's atmosphere (article) | Khan Academy
https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:earth-systems-and-resources/x0b0e430a38ebd23f:earths-air-and-water/a/earth-s-atmosphere
WebThe five principal layers of the atmosphere are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Troposphere: The troposphere is the layer closest to Earth. It is the densest layer (i.e., contains the most air particles), and is where most of Earth’s weather and cloud formation occurs. The troposphere is heated ...
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