Which of the following is an additional benefit to international trade?
A. The need to specialize becomes obsolete in trading.
B.- Trading encourages economic connections which
can avoid warfare.
C. Prices go up since there are lower economies of
scale based upon global trading.

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.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide