3. A jet is flying at an altitude of 8 km above sea level. The air pressure at this level is approximately _________ mb, and there is _______% of the atmosphere above the jet and _______% of the atmosphere below the jet. 4. Mountain climbers have climbed to the top of Mt. Everest at an altitude of 8.85 km above sea level. The air pressure at this level is approximately _________ mb, and there is _______% of the atmosphere above the mountain climbers and _______% of the atmosphere below the mountain climbers. 5. Tornado chasers are driving across the High Plains of west Texas and are passing through Lubbock whose city elevation is 920 meters above sea level. The air pressure at this level is approximately _________ mb, and there is _______% of the atmosphere above the storm chasers and _______% of the atmosphere below the storm chasers. 6. Daredevil skydivers ascend in a helium-filled balloon to an altitude of 25 km above sea level. The air pressure at this level is approximately _________ mb, and there is _______% of the atmosphere above the skydivers before they jump and _______% of the atmosphere below the skydivers before they jump.