Airborne particulate matter can be a complex mixture of organic and inorganic substances which might be divided into two groups: coarse and fine particles. The fine particles include formed aerosols (gas that looked to particles), combustion particles, and metal vapors. The large particles are items like dust in the road or a factory. The fine particles are the ones most directly associated with acid rain and people are the ones we are likely to deal with today. They have one of the most relevance on the new laws in California regulating the emissions from semi-tractor trailers. While Santa Cruz is not a big city, you will find there's major artery, highway 1 which runs through our lovely ocean side communities in addition to mining in high altitude which generate particulates too. Plasma can often be called the fourth state of matter, after solid, liquid, and gas. It is also sometimes described as an ionized gas i.e. a gas when the degree of energy is really high how the electrons escape from the atoms. This leads to soups of charged particles that happen to be overall quasi-neutral. Long before there have been machines to work out on and competitive sports to stay moving and before wars were being fought, man didn't think about conditioning as a way of keeping healthy. He simply knew if he didn't hunt, he wouldn't eat if he didn't run, something would hunt him. They were a down economy that focused simply on survival.