(a) What is the primary basis for the division of the atmosphere into different regions?

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Identify the primary factor that influences the division of the atmosphere into different regions.

Consider how temperature changes with altitude in the atmosphere.

Recognize that the atmosphere is divided into layers based on temperature gradients.

Understand that each atmospheric layer has distinct temperature characteristics.

Conclude that the primary basis for the division of the atmosphere into different regions is the variation in temperature with altitude.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Atmospheric Layers

The atmosphere is divided into distinct layers based on temperature gradients and composition. The primary layers include the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Each layer has unique characteristics, such as temperature changes with altitude and the presence of specific gases, which influence weather patterns and climate.

Temperature Gradient

The temperature gradient refers to the change in temperature with altitude in the atmosphere. In the troposphere, temperature decreases with height, while in the stratosphere, it increases due to the absorption of ultraviolet radiation by ozone. This gradient is crucial for understanding atmospheric stability and the behavior of weather systems.

Composition of the Atmosphere

The composition of the atmosphere varies with altitude, affecting its physical and chemical properties. The lower atmosphere contains a higher concentration of water vapor and pollutants, while the upper layers have less density and different gas compositions. This variation plays a significant role in atmospheric dynamics and the formation of different weather phenomena.

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(b) Name the regions of the atmosphere, indicating the altitude interval for each one.

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(a) How are the boundaries between the regions of the atmosphere determined?

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(b) Explain why the stratosphere, which is about 35 km thick, has a smaller total mass than the troposphere, which is about 12 km thick.

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