Which of the following statements about altitude and temperature is true?

The statement that temperature decreases as altitude increases for the troposphere is accurate based on the standard atmospheric model. In the troposphere, which is the lowest layer of Earth's atmosphere, temperature typically decreases with altitude. This is due to the decrease in atmospheric pressure and density as you ascend, leading to a decline in temperature.

The troposphere extends from the surface up to an average altitude of about 8 to 15 kilometers, depending on geographic location and weather conditions. The cooling trend is significant in this layer, averaging about 6.5 degrees Celsius per kilometer of ascent. This phenomenon plays a crucial role in weather patterns and aviation operations, as temperature changes with altitude can influence aircraft performance, such as lift and engine efficiency.

In contrast, other options do not reflect the established principles of atmospheric physics. Some suggest constant temperature or an increase in temperature with altitude, which does not apply to the troposphere, while statements dismissing the impact of temperature on aircraft operations overlook the critical nature of temperature in flight dynamics and safety.