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 troposphere is the lowest portion of Earth's atmosphere. It is the densest layer of the atmosphere and contains approximately 75% of the mass of the atmosphere and almo â¦ st all the water vapor and aerosols. The troposphere extends from the Earth's surface up to the tropopause, where the stratosphere begins.t is the densest layer of the atmosphere and contains approximately 75% of the mass of the atmosphere and almo â¦ st all the water vapor and aerosols.  The troposphere extends from the Earth's surface up to the tropopause, where the stratosphere begins.