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.
Average State Legislator Salary. Legislators in the Prairie State receive an annual base salary of $67,836 as of 2010, according to the National Council on State Legislatures. In addition to their base salary, legislators receive a $139 per diem payment for each day the legislature is in session.