stratosphere

"The blacklight made the fluorescent paint glow with ultraviolet. "

"...approximately 60 beats per minute."

"My brother is primarily a student; he spends most of his time studying. "

"The atmosphere was thick with the smell of popcorn, as the kids gathered for the movie night. "

"Satellites need to be above the mesosphere because the air is too thin to provide lift for airplanes, but thick enough to cause too much drag for long-term satellite orbits. "

"The geologist studied the rocks in the park. "

"The students, collectively, decided to postpone the project until next week. "

"The school is two kilometers from my house, so I usually take the bus. "

"The temperature in the room dropped nearly 20 degrees; it went from hot to cold."

"The cake was beautifully stratified, with layers of chocolate, vanilla, and strawberry cream. "

"Airplanes often experience turbulence when passing through the tropopause, the boundary between the troposphere and the stratosphere. "

"The absorption of new information during the lecture was crucial for passing the exam. "