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 mesosphere and the layers below it have a mixture of gases. The thermosphere is what we would normally considered space because the air density is very low. In this layer the air is very thin and cold.