Contaminacion

CONTAMINATION:
¿what is contaminatiòn ? 
Contamination is considered every damaging change produced physically, quimically and biologically speaking within life resources, that is to say, air, landand water.  
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Sources of contamination
Radioactive contamination is typically the result of a spill or accident during the production or useofradionuclides (radioisotopes), an unstable nucleus which has excessive energy. Contamination may occur from radioactive gases, liquids or particles. For example, if a radionuclide used in nuclearmedicine is accidentally spilled, the material could be spread by people as they walk around. Radioactive contamination may also be an inevitable result of certain processes, such as the release ofradioactive xenon in nuclear fuel reprocessing. In cases that radioactive material cannot be contained, it may be diluted to safe concentrations. Nuclear fallout is the distribution of radioactive contaminationby a nuclear explosion. For a discussion of environmental contamination by alphaemitters please see actinides in the environment. Containment is what differentiates radioactive material fromradioactive contamination. Therefore, radioactive material in sealed and designated containers is not properly referred to as contamination, although the units of measurement might be the same.

TERRORISM:Terrorism is the systematic use of terror especially as a means of coercion.[1] At present, the International community has been unable to formulate a universally agreed, legally binding, criminallaw definition of terrorism.[2][3] Common definitions of terrorism refer only to those violent acts which are intended to create fear (terror), are perpetrated for an ideological goal (as opposed to alone attack), and deliberately target or disregard the safety of non-combatants (civilians).
Some definitions also include acts of unlawful violence and war. The history of terrorist organizations...