Es subproducto de la combustión incompleta de materiales orgánicos (es decir que contienen carbono) como madera, aceite combustible, plásticos y desechos de los hogares. 30 veces más pequeñas que el diámetro de un cabello humano, por lo que puede entrar más rápido al sistema respiratorio y generar problemas en la salud de las personas:

i think it's a)sparta

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

these acts divided the south into five military districts.