As altitude increases, the available amount of oxygen to sustain mental and physical alertness decreases with the overall air pressure, though the relative percentage of oxygen in air, at about 21%, remains practically unchanged up to 21,000 metres (70,000 ft).
  State legislators in Texas (both representatives and senators) make a salary of $7,200 per year.
There is little reason for there to be public confusion over this fact, as it is widely reported and readily available on the House and Senate web sites. As of January 2009, Senators and Representatives receive $174,000 per year. Certain positions have higher rates of pay.The Majority and Minority Leaders in both the House and Senate and the President pro tempore of the Senate earn $193,400.The Speaker of the House earns $223,500. A table of historic data on Congressional salaries is accessible here.here is little reason for there to be public confusion over this fact, as it is widely reported and readily available on the House and Senate web sites. As of January 2009, Senators and Representatives receive $174,000 per year. Certain positions have higher rates of pay.