The lowest layer of the atmosphere is the troposphere.

Name: The lowest layer of the atmosphere is the troposphere.
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The troposphere is the lowest layer of the Earth's atmosphere, extending from the Earth's surface up to an altitude of about 7 to 20 km (4 to 12 miles) above sea level (depending on the location and season). This layer contains most of the Earth's weather and it is where we live and breathe.

The Lowest Layer of the Atmosphere Is the Troposphere