Assess the different hypotheses put forward for the mass extinctions at the end of the Permian and Cretaceous (KT) Periods. A mass extinction is an event in which at least 25-75% of species in the global environment are eradicated in a short period of time. Where as a regional extinction event is when the extinction is confined to a specific zone. Five mass extinctions have occurred throughout time‚ two of the most well known of these are the Permian and Cretaceous extinction events. There
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Introduction The Permian was the last period during the Paleozoic era. It occurred approximately 299 million years ago and was the point in time in which much of the earth’s land mass came together to form the supercontinent‚ Pangea. While years of study has relieved the climate conditions and life forms present during this period‚ the events surrounding the mass extinction that signified its end remains a mystery today. The end-Permian mass extinction is regarded as the largest mass extinction
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According to the anonymous author ‚ “Objectivity is neither possible nor desirable. It’s not possible because all history is subjective; all history represents a point of view."‚ which in other words means that people see history in the way they want to see it based on what they think is important. It is not possible to be objective because everything one says and thinks is based on our perceptions‚ knowledge‚ thoughts and feelings . It isn’t desirable because if someone is trying to get a point
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Geography Skills * Legend/key- a table showing what each symbol means on the map * Are reference- 4 figure e.g. 24 26 * Grid reference- 6 figure e.g. 243 265 * Latitude- left to right * Longitude- up and down * Direction of flow of a creek- usually towards a bigger river or sea and you can tell the direction by where the origin point is and where it finishes or joins a bigger river. Also the slope. * * Relief is the difference between the highest and
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Plate Tectonics Designed to meet South Carolina Department of Education 2005 Science Academic Standards Table of Contents Plate Tectonics: The Beginning (slides 3 and 4) Layers of the Earth (slides 5 and 6) Standard 8-3.1 What are Tectonic Plates- movement? (slides 7 and 8) Standard 8-3.6 Tectonic Plate boundaries (slides 9-21) 1. Convergent boundary Ocean-continent (slide 10) Continent-continent (slide 11) Oceanic-oceanic (slide 12) Volcanism (slide 13) 2. Divergent boundary Sea-floor
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Alternative medicine has been around for centuries‚ although it has just started to become very popular in countries such as The United States. Many people now are following the trend without knowing anything about alternative medicine. People should be aware of the benefits as well as the precautions involved in taking these natural remedies. The most common form of alternative medicine nowadays is herbal medicines. These natural remedies can be found in millions of American homes today. Herbal
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GEOGRAPHY OF INDIA Particulars Description Location The Indian peninsula is separated from mainland Asia by the Himalayas. The Country is surrounded by the Bay of Bengal in the east‚ the Arabian Sea in the west‚ and the Indian Ocean to the south. Geographic Coordinates Lying entirely in the Northern Hemisphere‚ the Country extends between 8° 4’ and 37° 6’ latitudes north of the Equator‚ and 68° 7’ and 97° 25’ longitudes east of it. Indian Standard Time Area Border Countries
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the case‚ it would contradict any other potential causes because this would eliminate any changes in the carbon cycle‚ oxygenation; however‚ temperatures could potentially have changed. The only issue with the continental plate movement is that the Pangea was already in place before the estimated time of the mass extinction occurrence ("Permian Extinction"). To conclude‚ a better way to look at the mass extinction and what caused it‚ is definitely a combination of all aspects‚ leading to the extinction
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Oceanography Test 1 Study Guide Chapter 1: Knowing the Ocean World An Ocean World • Ocean creatures provide 2% of humanity’s food • 1/3 of the world’s petroleum and natural gas are pumped from beneath the ocean floor • ~ 71% world is covered by water • Ocean – vast body of saline water that occupies the depressions of the earth’s surface • 97% of the water on or near the earth’s surface is contained in the ocean; less than 3% is held in land ice‚ groundwater‚ and freshwater
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Chapter 1 1.1 Earth Science & the Earth System -Earth science is the study of Earth and the processes that shape it -The earth system is composed of four principal components: atmosphere (air‚ weather)‚ hydrosphere (water‚ ice)‚ biosphere (plants‚ animals)‚ and geosphere (land‚ rocks). - Earth science can be broadly defined as the investigation of interactions among the four parts of the earth system. - The second largest earthquake ever recorded buckled the seafloor west of Sumatra‚ Indonesia
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