Oxygen is the third most abundantly found element in the universe. It is naturally found in the sun and plays a vital role in the stellar carbon cycle. Being the first member of Group 16 of the periodic table, oxygen is a chemically active element, forming compounds with nearly all the elements except the inert gases.he natural oxygen in the atmosphere called diatomic oxygen gas has a molecular mass of 32 while ozone (O 3), which is more reactive than natural oxygen, is another allotrope of oxygen formed due to electrical discharges, or ultraviolet light reacting with the atmospheric oxygen.
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The police can identify criminals recorded with cameras. Through surveillance cameras, the police can both prevent crimes from happening and can quickly solve criminal cases with material evidence. In addition, surveillance cameras protect against property theft, and vandalism. It is very difficult to get away with stealing something if there are cameras filming you. Therefore, the thief will often get caught. Surveillance cameras will catch the thief before, or during the process of committing the crime. If no one is aware of the crime until after it has been committed, the surveillance footage is always a crucial piece of evidence during a police investigation. Surveillance cameras have, and will prevent many crimes. Some people may say that we should not have surveillance cameras in public places. They claim that they invade privacy. That is false. Why be out in public if you want privacy? Just stay at home. Surveillance cameras are meant to keep you and other property safe, not to stalk you.