Based on the nebular theory, which of these is a step in the formation of the center of a new planetary system? a) evaporation of condensed gases due to heat b) combination of condensed gases due to gravity c) contraction of condensed gases due to nuclear fission d) expansion of condensed gases due to nuclear fission .

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

terd muffin is the correct answer