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Answer:

Troposphere

Features Found:

• The air is densest in this lowest layer. In fact, the troposphere contains three-quarters of the mass of the entire atmosphere. The air here is 78% nitrogen and 21% oxygen. The last 1% is made of argon, water vapor, and carbon dioxide.

Description:

- The troposphere is the lowest layer of Earth's atmosphere. Most of the mass (about 75-80%) of the atmosphere is in the troposphere. Most types of clouds are found in the troposphere, and almost all weather occurs within this layer.

Stratosphere

Features Found:

• The stratosphere is very dry, with very little water vapour in the air. As a result, this layer has few clouds; almost all clouds form in the lower, more humid troposphere. The exception is polar stratospheric clouds (PSCs). In the winter, PSCs can be found in the lower stratosphere near the poles.

Definition:

- The stratosphere is a layer of Earth's atmosphere. It is the second layer of the atmosphere as you go upward. The troposphere, the lowest layer, is right below the stratosphere. The next higher layer above the stratosphere is the mesosphere

Mesosphere

Features Found:

• The main most important features in this region are strong zonal (East-West) winds, atmospheric tides, internal atmospheric gravity waves (commonly called "gravity waves"), and planetary waves.

Definition:

- The third layer of the atmosphere, directly above the stratosphere and directly below the thermosphere. In the mesosphere, temperature decreases as altitude increases.

Thermosphere

Feature found:

• It is characterized by high temperature and large variability, in response to changes in solar ultraviolet radiation and solar-driven geomagnetic activity.

Definition:

- It is the layer that is located between the mesosphere and the exosphere. It has an extension that begins between 80 and 120 kilometers from the Earth

Exosphere

Features Found:

• The exosphere has gases like hydrogen and helium, but they are very spread out. There is a lot of empty space in between. There is no air to breathe, and it's very cold.

Definition:

- The exosphere is the uppermost region of Earth's atmosphere as it gradually fades into the vacuum of space. The air in the exosphere is extremely thin - in many ways it is almost the same as the airless void of outer space.

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