Explanation:
1. Newton's universal law of gravitation states that every particle in the universe attracts every other particle with a force along a line joining them. The force is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
2.Bottom because the direction of the gravitational force is always downward toward the center of the Earth ... where the winds are stronger; the mixing tends to reduce the air flow at the higher altitude. (I think its bottom).
