The upper most layer of the earth is exosphere. because it is the last layer and in this layer nitrogen present and no living beings can't be live

The uppermost layer of the atmosphere is the exosphere.

The exosphere is the outermost layer of the Earth's atmosphere, extending from the top of the thermosphere to the edge of space. It is characterized by extremely low density and high altitude, with its outer boundary reaching up to 10,000 kilometers above the Earth's surface.

Characteristics of the Exosphere:

1. Low Density: The exosphere is the least dense layer of the atmosphere. It consists mainly of individual atoms and molecules that are widely spaced apart. Due to the low density, the particles in the exosphere can travel long distances without colliding with each other.

2. High Altitude: The exosphere is located at the highest altitudes of the atmosphere. Its upper boundary, known as the exobase, gradually merges with the vacuum of space. The exobase is not a sharp boundary but rather a region where the density of the atmosphere becomes very low.

3. Transition to Space: The exosphere is the region where the Earth's atmosphere transitions into outer space. The particles in the exosphere can escape the Earth's gravitational pull and move freely into space. This process is known as atmospheric escape.

4. Presence of Light Gases: The exosphere contains light gases such as hydrogen (H2), helium (He), and traces of other elements. These gases have low molecular weights and can reach high altitudes in the exosphere due to their low density.

5. Absence of Weather: Unlike the lower layers of the atmosphere, the exosphere is not affected by weather phenomena such as clouds, winds, or temperature fluctuations. It is a region of relative calmness and stability.

6. Presence of Satellites: The exosphere is an important region for satellite operations. Many artificial satellites orbit the Earth within the exosphere, taking advantage of its low density and lack of atmospheric interference.

Conclusion:

In conclusion, the uppermost layer of the Earth's atmosphere is the exosphere. It is characterized by low density, high altitude, and the transition to outer space. The exosphere plays an important role in satellite operations and is a region where atmospheric particles can escape into space.