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
PLAY. 1  lst layer, most dense, jet stream, gets coldest faster, air is thin in high altitude(less oxygen, and gets colder), most weather happens, most water vapor, dust particles, clouds because 80% of atmosphere mass is in this layer.