Atmosphere of Earth and balloons, and too low to permit orbital spacecraft. The mesosphere is mainly accessed by sounding rockets and rocket-powered aircraft. The stratosphere is the second-lowest layer of Earth's atmosphere. It lies above the troposphere and is separated from it by the tropopause. This layer extends from the top of the troposphere at roughly above Earth's surface to the stratopause at an altitude of about . The atmospheric pressure at the top of the stratosphere is roughly 1/1000 the pressure at sea level. It contains the ozone layer, which is the part of Earth's atmosphere that contains relatively high concentrations of
Live Earth concert, Washington, D.C. Gore speak and Brooks play from what event organizers called a "JumboTron" outside the immediate viewing area. Due to last minute organizing, there were no working audio speakers that could project sound to the JumboTron viewers. Live Earth concert, Washington, D.C. The Live Earth concert in Washington, D.C., officially known as "Mother Earth", was held on the National Mall in Washington, D.C., United States and was sponsored by and held on the premises/venue of the Smithsonian's National Museum of the American Indian. It was only hours before the Washington D.C. concert was scheduled to begin that organizers were able to