Exploration of this part of the atmosphere was conducted in the nineteenth century with hot-air balloons.
A) Stratosphere
B) Troposphere
C) Mesosphere
D) Thermosphere

Question

Quizplus · Accepted Answer

The troposphere is the lowest layer of Earth's atmosphere, where weather phenomena occur and where conditions are suitable for hot-air balloons to operate. In the nineteenth century, balloons were a primary method for exploring and studying the atmosphere directly above the Earth's surface.

Exploration of This Part of the Atmosphere Was Conducted in the Nineteenth