Final answer:
The troposphere is the lowest layer of the Earth's atmosphere where weather occurs and the temperature decreases with increasing altitude.
Step-by-step explanation:
The troposphere is the lowest layer of the Earth's atmosphere, extending from the surface to an altitude of about 11-13 km (7-8 miles). It is where weather occurs due to the presence of water vapor and convection processes.
The temperature in the troposphere decreases steadily with increasing altitude, making it cooler at higher altitudes.