What are the Principles of Relative Geologic Age Determination? They are summarized as the Principles of Relative Geologic Age Determination, sometimes referred to as the Principles of Relative Dating. Geologists still use Steno's principles, with some refinements and additions. He published the results of his work and established a basic set of principles for interpreting sedimentary strata. Steno made careful geologic observations and illustrations. Stratigraphy started to become a formal science due to the work of a man who published under the name Nicolaus Steno in the 17th century. How would today's sediments appear to a geologist millions of years in the future examining outcrops of sedimentary rock that originated in our time? What would the geologist be able to deduce about the world we live in, based on what was left in the strata? This gives information on processes such as tectonic plate collisions, terrane accretion, and volcanic activity.Īsk yourself how the things that are happening in the world today might end up being recorded in the sediments that are now or soon will be deposited. The structural arrangement of the layers - how the strata are affected by folds, faults, or igneous intrusions.This allows the story to be told sequentially as a series of changes, some gradual, some abrupt. The sequence of strata - which layer is on top of which.This reveals what was happening at the time the layer of sediment was being deposited in terms of geological activity, water, climate, and living things What exactly is in each stratum (layer)- the types of rocks and minerals, the sedimentary structure, and the fossils.The details of a region's stratigraphic story are revealed by: What is the Role of Stratigraphy in Understanding Geologic History? The stratigraphy of an area provides the basis for putting together the geologic history of an area. Stratigraphy is the study of rock layers and reconstruction of the original sequence in which they were deposited. How Do Unconformities Mark Missing Time?.What are the Principles of Relative Geologic Age Determination?.What is the Role of Stratigraphy in Understanding Geologic History?.(c) Will the cure mentioned in the article be effective against indoor pollution in developing countries? Discuss why or why not. (a) According to the article, what is the cause of sick building syndrome and what are the advantages of this cure? (b) What other sources of indoor pollution contribute to sick building syndrome? Will ultraviolet light be effective against these sources? Suggest one additional control measure that would be effective against SBS. Installing the systems would be relatively cheap and could save companies millions by reducing rates of sickness. Scientists said the UVGI killed the bacteria and molds in ventilation systems. Muscular complaints also halved, according to the study. There were 40 percent fewer complaints about respiratory problems and a 30 percent reduction in people complaining of stuffy noses. The lights resulted in a 20 percent reduction in all symptoms. They installed UVGI (ultraviolet germicidal irradiation) in the ventilation systems of the buildings and compared reports of illness when the lights were turned on with sickness rates when they were off. Researchers from the Montreal Chest Institute in Canada tested three offices in the city where people suffered from SBS. Bacteria can build up in the ventilation systems and leave office workers suffering from a range of problems, such as breathing difficulties, headaches, sore throats, stuffy noses and itchy eyes. So-called sick building syndrome (SBS) is caused by the in creasing use of air conditioning in modern offices. Ultraviolet light in ventilation system cures sick building syndrome. The following appeared in Medical News Today on November 28, 2003. Where calculations are required, show your work. Support your answers with relevant information and examples.
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