The Earth is comprised of 4 layers named the troposphere, stratosphere, mesosphere, and thermosphere. The troposphere is approximately 12 kilometers in range and supports life because its oxygen is rich and warm. The stratosphere is approximately 40 kilometers in range and does not support life because the air is thin and cold. Most commercial aircraft fly within the stratosphere. The mesosphere is 30 kilometers in range and is where the coldest Earth temperatures are found (-85 degrees Celsius)...
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