What is the most abundant gas in the lower atmosphere?

What planets would a person weigh less than on earth? Did Hypatias biographer think she invented the astrolabe? What thunderstorms form the portion of the atmosphere that the cloud grow through must be? What is the distance of the Taurus constellation from earth? Why don't we notice the changes in the elevation of the land due to the Moon's pull? Is a blanket opaque? What is a sentence using the word debunking? What would it be like living in a spaceship? Who was the first biped to set a foot on the moon? What types of minerals or gases are found on the Sun? What is a cyroshere? What is the size of the betelgeuse in km? How did Apollo 11 land back on earth? Why the first dog was sent into space? One method of raising a sunken ship to the surface is to inflate large bags or balloons inside its hull explain why this procedure could work? Why bottom of ship made heavy? Why is the china flag red with yellow stars on it? Did Yuri Gagarin have any kids? Why is the nose of the space shuttle painted black? What causes seasons to change in the northern and southern hemispheres as the earth revolves around the sun?