The bottom of the troposphere is at Earth’s surface, and it extends up about 6.2 miles (or 33,000 feet). About 75-80 percent of the atmosphere’s mass is in the troposphere.

Layers of the Earth's atmosphere. TERRY THOMAS; Dec 23, 2023 Dec 23, 2023 ... the layer that kisses the Earth, and the stratosphere, the next layer up. If you are an airline traveler, ...

Intense pressure and sweltering temperature would accompany a trip down through Earth's layers and out through the other side. However, this trip would be possible only in science fiction.