What is the name of the lowest layer of the atmosphere?

The lowest layer of the atmosphere is known as the troposphere. This layer extends from the Earth's surface up to about 8 to 15 kilometers (5 to 9 miles) in altitude, depending on geographic location and weather patterns. The troposphere contains the majority of the atmosphere's mass, including water vapor, dust, and other particles, which contribute to weather phenomena.

Temperature decreases with altitude in this layer, leading to the weather we experience daily. Additionally, the troposphere is where most of the atmospheric mixing occurs, resulting in clouds and other weather patterns that are essential for ecosystems on Earth. Understanding the characteristics of the troposphere is fundamental in fields related to meteorology, aviation safety, and environmental science.