The lowest level of the Earth's atmosphere is called the troposphere. The troposphere is the layer of the atmosphere closest to the Earth's surface, extending from the surface up to an average altitude of about 8 to 15 kilometers (5 to 9 miles) depending on the location. It is where the majority of Earth's weather occurs, with phenomena such as clouds, rain, and winds taking place within this layer.

The troposphere is also where the majority of Earth's greenhouse gases are found, including carbon dioxide, methane, and water vapor. These gases trap heat from the sun, leading to the warming of the Earth's surface in a process known as the greenhouse effect. This layer of the atmosphere plays a crucial role in regulating the Earth's temperature and climate.

One interesting fact about the troposphere is that it contains about 75% of the Earth's atmosphere by mass. This means that the majority of the air we breathe is located in this lowest layer of the atmosphere. As you move higher up in the atmosphere, the air becomes thinner and less dense, making it harder to breathe.

For more information on the troposphere and the Earth's atmosphere in general, you can visit the NASA website or the National Oceanic and Atmospheric Administration (NOAA) website. These resources provide in-depth information on the composition and function of the Earth's atmosphere, as well as the latest research on climate change and its impact on the atmosphere.

In conclusion, the lowest level of the Earth's atmosphere is known as the troposphere. This layer is vital to the Earth's climate and weather systems, as well as to the overall composition of the atmosphere. Understanding the troposphere and its role in the Earth's ecosystem is essential for addressing environmental issues such as climate change and air quality.

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