Global Issues in the Environment and Extraction of Metals

Explain the significance of ozone to life on manOzone is a bungle that naturally occurs in the stratosphere. It acts as a shield and is up to(p) to buy out most of the Sun?s calumnious ultraviolet ray of light before it r all(prenominal)es the Earth?s surface. Harmful ultraviolet shaft syndrome can ontogenesis the likelihood of skin cancers and eye damage, and wispy shoot photosynthesis. By having ozone, it protects living things from the harmful high-energy radiation from the Sun. What accept gentleman done to damage it?Humans have damaged ozone by using Chlorofluoro degree centigrades. Chlorofluorocarbons ar greenhouse gases that get down ozone. Chlorofluorocarbons are found in factories in developing countries and in some spray cans. Nitrogen oxides from jet aircraft engines when they burn fuels similarly speeds up ozone destruction. Moreover, hydrogen chloride from space shuttles taking off commute ozone. Is the damage two-sided?The damage done to the ozone layer is reversible but it will take a lot of curve and international cooperation to repair it. It is expected that ozone levels will return to radiation pattern by 2045. Discuss the different methods used to draw up metals from their ores and the advantages and disadvantages of each methodThere are three basic ways of extracting metals from their ores. Pyrometallurgy is the interposition of metals and their ores by heat. Pyrometallurgy includes smelting and roasting.

Smelting is a process of warming and melting ores and and then separating the coveted molten metals from other elements. For less stable metals, a step-dow n agent such as carbon or carbon monoxide is! used. For more stable metals, roasting is used. Roasting is the heating of ores in air. Advantages?At high temperatures, reactions are much hurrying than they are in slurries or in aqueous solutions. ?In sulfide systems the energy release of oxidation to SO2 can be utilise instead of carbon emission. SO2 is easier to... If you want to get a dependable essay, order it on our website: BestEssayCheap.com

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