World Mourns Loss of Skier. U.S. Freeskiing, and the entire U.S. Ski and Snowboard Association family, joined the Park City community in mourning the passing of Sam Jackenthal, a wonderful young man and a remarkable athlete.
The least dense layer of the earth is the Crust , the mantle is second densest , whereas the core is the most dense layer of the earth
The same would be true of particles and other pollutants in the air. TO THE EDGE OF SPACE. All of those gases and particles are not evenly distributed in the atmosphere, And the atmosphere is not evenly distributed by mass or weight. The densest and heaviest part of the atmosphere is near the Earth. The atmosphere becomes thinner as you go higher above the Earth's surface.