The second issue of Food Security is now published, and is free online. It documents some of the multiple causes of food insecurity.
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 can be used for a range of different things. Helium is renowned for the fact that it is lighter than air. This can be used for lifting probes and vehicles into the uppe â¦ r atmosphere. Examples of this are blimps and weather balloons.