Petroleum

Petroleum is a fuel, which is usually referred to as crude oil. Like coal and some natural gasses, petroleum is a fossil fuel. This means that petroleum is made by plant and animal decay over a very long amount of time. By the heat and pressure the decay will sooner or later change into petroleum. All of the fossil fuels are nonrenewable. This means that once you have used this fuel, they will not be replaced. Oil tends to be trapped where rocks are shaped upwards, or where permeable rocks, rocks that allow any liquids or gases to pass through … Continue reading Petroleum

Disposal Systems

Getting rid of wastewater and sewage is called sewage disposal. If sewage is not disposed efficiently or contained appropriately people may come into contact with it and get very sick. This is why there are sewage disposal systems. A sewage disposal system is where every household disposes their wastewater in an efficient way. There are different types of sewage systems, which are usually called on-site systems and sewage or effluent systems. An on-site system is a system which that treats the sewage in a septic tank so that most of the sewage is discharged in a river or a sea closest to your household or … Continue reading Disposal Systems

Polio

Polio or poliomyelitis is a highly contagious virus that attacks the brain and nervous system. Children younger than 5 years old are more likely to catch this virus and more than two hundred thousand children have been affected by this disease. There are tree types of polio: sub-clinical, non-paralytic and paralytic. About 95% of the people who catch polio have sub clinical polio and many of these cases do not have symptoms. This form of polio does not affect the brain and spiral cord (central nervous system). Non-paralytic polio does affect the central nervous system. Even though it does not … Continue reading Polio