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.
Once released from the ground, it escapes rather quickly to space. Despite overall rarity on Earth, helium is concentrated in large quantities under the American Great Plains, available for extraction as a byproduct of natural gas. Do you know what the chemical symbol for Helium is?