Geology 118 Study guide (Final exam)

Geology 118 Study guide (Final exam) - Topic 27 1....

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Topic 27 1. Definition of climate- Long-term atmospheric and surface condition of an area. 2. Impact of global warming on sea level- Warming causes glaciers to melt which would cause the sea level to raise, but if it cools more water will freeze increasing glacier coverage of the earth and reducing the sea level. 3. Glacier effects on earths landscape- When glaciers melt they cause flooding which creates lakes. They also flatten land deposit minerals creating fertile land such as the mid-west. 4. two gases making up 99% of atmosphere and how much is CO2 - Nitrogen and Oxygen and .04 CO2. 5. What is greenhouse effect- The sun gives off light at a shorter wavelength than the earth so that the earths atmosphere lets visible light from the sun through but does not let the longer wavelengths from the earth through warming the earth. Without it the earth would be 33 degrees colder and there would be massive temperature changes from day to night. CO2, Ch4 O3, ClFO, NO are all greenhouse gases. 6. What types of elecromagnic radiation are involved in the greenhouse effect- Visible light with shorter wavelengths from the sun and infrared radiation from the earth with longer wavelengths. CO2 and H2O trap the infrared rays inside the earths atmosphere keeping the earth warm even at night without sunlight. Topic 28 1. 2 major goals in effective communication involving scientific writing- Communicately clearly and efficiently 2. Title should be brief interesting and highly informative and capture the audience’s attention. Overall organization- and the use of concrete words clear. Verb tense active versus passive. Topic 28a 1. Volcanism- more CO2 causes heating. Chemical weathering- less CO2 due to dissolving minerals and rock puts HCO3 into the ocean thus causes cooling. Burning fossil fuels- increases CO2 causes warming Photosynthesis- Uses CO2 to create organic mlcs and O2 Respiration- creates CO2 using o2
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2. General nature of earths climate hot house vs icehouse and the major factor controlling earths climate for the following intervals of geologic time early earth Precambrian, end of Paleozoic, end Mesozoic beginning Cenozoic, middle to end of Cenozoic, and end of Cenozoic and Pleistocene period. Early earth is hot due to volcanic eruptions 290 C End of Paleozoic very cold extensive glaciers due to continents of the southern hemisphere being located on the pole and gaining glaciers. M and C- CO2 gas by volcanism within the atlantic ocean so very warm Cenozoic- cooling due plate tectonics creating mountain ranges which caused weathering and also diatoms creation photosynthesis in the ocean. Plristocene- Oscillations from cold to warm with 20 ice ages in the last 2 million years. Topic 29
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This test prep was uploaded on 04/13/2008 for the course GEOG 118 taught by Professor Altaner during the Spring '08 term at University of Illinois at Urbana–Champaign.

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Geology 118 Study guide (Final exam) - Topic 27 1....

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