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.
Making the world better, one answer at a time. The base salary for US Congressmen is $174,000 plus benefits, plus official expenses (such as for staff, travel, office equipment supplies, totaling around $1.5 million per year). Congressmen and Senators make $174,000     Speaker of the House makes $223,500     Minority and Majority leaders in both houses make $193,400.