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Questions and Answers
The atmosphere is divided into layers. What characteristic makes measuring these layers challenging?
The atmosphere is divided into layers. What characteristic makes measuring these layers challenging?
- The layers have clearly defined and sharp boundaries.
- The boundaries between the layers are not sharp and are hard to measure precisely. (correct)
- The layers are constantly changing temperature.
- The layers are all the same thickness.
What percentage of the atmosphere's mass of gases is held within the troposphere?
What percentage of the atmosphere's mass of gases is held within the troposphere?
- 25%
- 50%
- 100%
- 75% (correct)
How does the average air pressure change in the troposphere as altitude increases?
How does the average air pressure change in the troposphere as altitude increases?
- Remains constant at 100 mb.
- Decreases from 1000 mb to 100 mb. (correct)
- Increases from 100 mb to 1000 mb.
- Remains constant at 1000 mb.
Which layer of the atmosphere lies directly above the troposphere?
Which layer of the atmosphere lies directly above the troposphere?
What is the approximate air pressure at the top of the stratosphere?
What is the approximate air pressure at the top of the stratosphere?
If the temperature at the bottom of the stratosphere is $30^{\circ}C$, what is the approximate temperature at the top of the stratosphere?
If the temperature at the bottom of the stratosphere is $30^{\circ}C$, what is the approximate temperature at the top of the stratosphere?
Which atmospheric layer extends from about 48 km to 85 km above the Earth's surface?
Which atmospheric layer extends from about 48 km to 85 km above the Earth's surface?
Which of the following statements accurately describes the troposphere?
Which of the following statements accurately describes the troposphere?
Which of the following statements concerning the stratosphere is most accurate?
Which of the following statements concerning the stratosphere is most accurate?
Based on the information, what is a key difference between the troposphere and the stratosphere?
Based on the information, what is a key difference between the troposphere and the stratosphere?
Flashcards
Atmospheric Layers
Atmospheric Layers
The atmosphere has five layers with indistinct boundaries, making precise measurement difficult.
Troposphere
Troposphere
Extends from the Earth's surface up to about 13 km, containing 75% of the atmosphere's mass.
Tropospheric Changes
Tropospheric Changes
In the troposphere, temperature decreases as altitude increases; air pressure drops from 1000 mb to 100 mb.
Stratosphere
Stratosphere
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Stratospheric Temperature
Stratospheric Temperature
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Mesosphere
Mesosphere
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Study Notes
- The atmosphere has five distinctive layers
- Boundaries between layers are not sharp and can be hard to measure precisely
Troposphere
- The Troposphere extends from the Earth's surface up to about 13 kilometers (km)
- This layer holds 75% of the atmosphere's mass of gases
- As you go higher up the troposphere, temperature drops from an average of about 13°C near the Earth's surface to -50°C at the top of the layer
- The air pressure drops from 1000 millibars (mb) near the Earth's surface to 100 mb at the top of the layer
Stratosphere
- The Stratosphere lies directly above the troposphere
- It extends from about 13 km to about 48 km above the Earth's surface
- The temperature of the bottom of the layer is 30°C but at the top it is 15°C
- The air pressure at the bottom of the layer is about 100 mb but at the top of the layer the air pressure is only 1 mb
Mesosphere
- The Mesosphere lies directly above the stratosphere
- It extends from about 48 km to about 85 km above the Earth's surface
- The temperature of the bottom of the layer is 30°C but at the top it is
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