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Grade 8 / Middle 2 (age 13-14)

grade 8 Layers of the Atmosphere

Layers of Atmosphere

The atmosphere is the blanket of air that wraps around Earth. By altitude it splits into four layers, the troposphere, stratosphere, mesosphere, and thermosphere, each with its own temperature pattern. Weather forms in the moist, convective troposphere, while the ozone layer that blocks ultraviolet sits in the stratosphere. Change the altitude and you see which layer you are in and how temperature shifts with height.

What is the Atmosphere?

🌍 Air That Surrounds Earth
①Atmosphere: gaseous envelope around Earth
②Divided into 4 layers by altitude
③Each layer has its own temperature pattern
8 km

Temperature Profile

🌡️ Different Temperature Trends
①Troposphere: altitude↑ → temp↓ (~6.5 °C / km)
②Stratosphere: altitude↑ → temp↑ (ozone absorbs UV)
③Mesosphere: altitude↑ → temp↓
④Thermosphere: altitude↑ → temp↑↑ (very high)
⑤Temperature inversion: in the troposphere height↑ can briefly mean temp↑

Summary

Troposphere
0–12 km — weather occurs
altitude↑ temp↓, active convection; clouds, rain, wind
Stratosphere
12–50 km — ozone layer present
altitude↑ temp↑, stable; aircraft cruise
Mesosphere · Thermosphere
50–80 km / 80 km+
Mesosphere: meteors burn / Thermosphere: aurora, very high temp
🎯 Exam Key Points
①Troposphere: weather, convection, altitude↑ temp↓
②Stratosphere: ozone, stable, altitude↑ temp↑
③Mesosphere: meteor burnup, lowest temperature
④Thermosphere: aurora, ionosphere, highest temperature
⑤Temperature inversion: localized temp rise in the troposphere

Examples and Unit Test

Example 1
List the layers of the atmosphere from lowest to highest, and explain how the temperature changes with height in the troposphere and the stratosphere.
1
From the bottom up: troposphere (0~12 km) → stratosphere (12~50 km) → mesosphere (50~80 km) → thermosphere (above 80 km).
2
In the troposphere temperature falls with height, while in the stratosphere the ozone layer absorbs ultraviolet, so temperature rises with height.
▸ Troposphere → stratosphere → mesosphere → thermosphere / troposphere = higher means colder, stratosphere = higher means warmer
The direction of temperature change flips layer by layer, and that is how the atmosphere is divided.
Example 2
In which layer do weather events such as clouds and rain occur, and why is the stratosphere stable?
1
In the troposphere it gets colder with height, so warm air below rises and convection is active, producing clouds and rain.
2
In the stratosphere it gets warmer with height, so the air mixes little and stays stable, which suits aircraft.
▸ Weather = troposphere (active convection, has water vapor) / stratosphere = warmer above means no convection, so stable
How temperature changes with height decides whether convection happens.
Unit Test
Which statement about the atmosphere is correct?
①In the troposphere temperature rises with height
②The ozone layer is in the mesosphere
③Weather events occur in the troposphere
④The thermosphere has the lowest temperature in the atmosphere
⑤Meteors mostly burn up in the stratosphere
▸ ③ Weather events occur in the troposphere
1
In the troposphere temperature falls with height (① wrong), and the ozone layer is in the stratosphere (② wrong).
2
The thermosphere has the highest temperature (④ wrong), and meteors burn up in the mesosphere (⑤ wrong); weather occurs in the troposphere where water vapor and convection are present (③ correct).
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Humidity & Clouds
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