Distrito Federal had a total population of 8,605,239 in 2000; of the total, 4,110,485 (48%) were men and 4,494,754 (52%) were women. The population density was 5,799 people per square kilometer (15,019 people per square mile). The Distrito Federal is the most densely populated region of the country.
Confidence votes 5.0K. Helium can be found in underground deposits in the earth. Helium can also be found in stars and other planets. +++. The helium underground-and extracted from natural-gas-is a by-product of the natural radioactive decay of uranium, though is far too stable to be radioactive itself. It also occurs in very small amounts in the atmosphere.
Helium(n.) An inert, monoatomic, gaseous element occurring in the atmosphere of the sun and stars, and in small quantities in the earth's atmosphere, in several minerals and in certain mineral waters. It is obtained from natural gas in industrial quantities. Symbol, He; atomic number 2; at. wt., 4.0026 (C=12.011). Helium was first detected spectroscopically in the sun by Lockyer in 1868; it was first prepared by Ramsay in 1895. Helium has a density of 1.98 compared with hydrogen, and is more difficult to liquefy than the latter.