Investigators have noted the importance of rain or snow in washing fallout particles from the air in the troposphere.
Here, well above the troposphere, the air was thin and always clear.
In distinction from the stratosphere, the part of the atmosphere lying below it is called the troposphere.
At last Ken leveled off in the troposphere, at an altitude of five miles.
The dense reaches of the troposphere—the weather belt where storms are born—dropped below them.
Below this level is the troposphere, the turbulent zone of clouds, rain, and fog.
The lowest and densest region of the Earth's atmosphere, extending from the Earth's surface to the tropopause. The troposphere is characterized by temperatures that decrease with increasing altitude. At the top of this region, temperatures are close to -55°C (-67°F). The weather, major wind systems, and cloud formations occur mostly in the troposphere. See also exosphere, mesosphere, stratosphere, thermosphere., See illustration at atmosphere.