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The troposphere is the lowest layer of Earth's atmosphere, extending from the surface up to an altitude of approximately 8 to 15 kilometers (5 to 9 miles) above sea level. It is where most weather phenomena occur, including clouds, precipitation, and atmospheric mixing. The troposphere contains the highest concentration of gases such as nitrogen, oxygen, and water vapor, which are vital for supporting life and influencing weather patterns.

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The troposphere is the lowest layer of Earth's atmosphere where weather events occur. It's the layer closest to the Earth's surface and contains about 75% of the atmosphere's mass. This layer is where we experience changes in temperature, humidity, and air pressure that influence our daily weather patterns.