What is the lowest atmosphere on earth?

http://www.windows2universe.org/earth/Atmosphere/layers_activity_print.html

Troposphere!

The lowest layer of Earth's atmosphere is called the troposphere. It is the layer closest to the surface and extends up to an average altitude of about 8 to 15 kilometers (5 to 9 miles), depending on the location and season. The troposphere contains most of Earth's weather phenomena, such as clouds, precipitation, and temperature variations. It is where we live and where most of our planet's air mass is located.

If you want to find this information on your own, you can start by searching for "Earth's atmospheric layers" or "layers of Earth's atmosphere" in a search engine. This will provide you with various sources that explain the different atmospheric layers, including the lowest layer, which is the troposphere. Websites like NASA or educational resources like encyclopedias often provide reliable information on this topic.