GEOE 203 Fall 2023 Exam 4
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School
Casper College *
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Course
203
Subject
Geology
Date
Jan 9, 2024
Type
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4
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User xxxx-xxxx Course GEOE 203: Earth Dynamics - 01708 - F23 (ONLINE) Test GEOE 203 Fall 2023 Exam 4 Started 11/11/23 9:01 PM Submitted 11/11/23 9:58 PM Due Date 11/12/23 11:59 PM Status Completed Attempt Score 35 out of 44 points Time Elapsed 57 minutes out of 1 hour Results Displayed Submitted Answers, Feedback •
Question 1 1 out of 1 points What can trigger a mass wasting event? Selected Answer: all of the above •
Question 2 1 out of 1 points Which of the following types of mass movement is the slowest? Selected Answer: solifluction •
Question 3 1 out of 1 points Which of the following is a way to remedy the unsafe slope? Selected Answer: All of the above •
Question 4 0 out of 1 points What is the “safety factor” in geology?
Selected Answer: OSHA regulations for workplace safety •
Question 5 1 out of 1 points What are the two types of weathering? Selected Answer: Mechanical & Chemical •
Question 6 1 out of 1 points What is the primary force that causes mass wasting? Selected Answer: gravity •
Question 7 1 out of 1 points
Conversion of saturated sand or silt into a liquid state under rapid or cyclical stress (vibrations), such as from earthquakes, is called what? Selected Answer: liquefaction •
Question 8 5 out of 5 points What is shown in this photograph (tell me what the numbers mean) and what caused it to happen? Selected Answer: This photograph shows the approximate location of maximum subsidence in the United States. Signs on pole show approximate altitude of land surface in 1925, 1955, and 1977. The land surface subsided about 9 meters from 1925 to 1977 due to aquifer system compaction. In fact, the compaction of unconsilidated aquifer system than can accompany excessive ground water pumping is by far the single largest cause of such aquifer systems and has resulted in permanent sudsidence and related ground failure. Response Feedback: [None Given] •
Question 9 0 out of 1 points Which of the following statements about the walls of The Grand Canyon is true? Selected Answer: the steepest sections are the sandstone layers because they are permeable and let the ground water through •
Question 10 5 out of 5 points Explain the difference between Porosity and Void Ratio. Selected Answer: Soil usually consists of particles, water, and air. The porosity n of a given soil sample is the ratio of the volume of void to the total volume of the given soil mass. Void ratiois defined as the ratio of the volume of void to the volume of soil solids in the given soil mass. Response Feedback: [None Given] •
Question 11 1 out of 1 points Weathering of rocks ____ Selected Answer: both a and c •
Question 12 2.5 out of 5 points There is a hill overlooks a beautiful lake and the land owners want to build a resort at the top of the hill. Using the diagram and values given below, calculate the Safety Factor for the slope and tell me if this hill is a good candidate for the construction project they want to do.
L = 30, R = 14, X = 4, S = 700, W = 73,000 Selected Answer: sf= ((700)*(30)*(14))/(73000)*(4). sf= 1.006 Response Feedback: Yes, but you missed the second part of the question... is it safe to build there? (the answer is that no, it is not safe) •
Question 13 0 out of 1 points Which of the following are mechanical weathering? Selected Answer: exfoliation •
Question 14 1 out of 1 points What effects does weathering have a rock? Selected Answer: all of the above •
Question 15 0 out of 1 points What is the most costly natural hazard in the United States? Selected Answer: Hurricanes •
Question 16 2.5 out of 5 points What dangerous phenomenon can occur when there is an earthquake and there is damp sand or clay in the ground? Explain why it happens. Selected Answer: DANGEROUS PHENOMENO THAN CAN OCCURS WHEN THERE IS AN EARTHQUAKE IS LUFICATION. tHIS HAPPEN DUE TO THE SUBSIDENCE OR THE COLLAPSE OF GROUND. Response Feedback: You are correct that it is called liquefaction, but it is not from subsidence or collapse. Liquefaction is when wet sediment behaves like a liquid because the vibrations increase pore pressure, pushing the grains further apart, which reduces internal friction, which reduces shear strength, which allows it to behave like a liquid (which has no shear strength) •
Question 17 1 out of 1 points If you are walking through a city and see a very old marble statue that is missing most of it’s face and other fine details, what is the most likely reason for the damage to the statue? Selected Answer: raindrops contained acid and reacted with the marble causing damage (chemical weathering) •
Question 18 5 out of 5 points
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What type of soil problem causes the most damage in the United States? Why is it so damaging? Selected Answer: The type of soil that cause the most of damage in US is expansive soisl. Indeed, it contains clay soils that swell and shrink with changes in moisture content. Response Feedback: [None Given] •
Question 19 1 out of 1 points What is the type of soil that is quite fertile, but has a high content of expanding clays? Selected Answer: vertisol •
Question 20 1 out of 1 points If you see Karst topography, why kind of bedrock is in the area? Selected Answer: limestone •
Question 21 1 out of 1 points Of these types of mass movement, which is is the fastest? Selected Answer: avalanche •
Question 22 1 out of 1 points What are pedogenic processes? Selected Answer: soil forming activities •
Question 23 1 out of 1 points Why does farming cause erosion damage to the land, they are after all planting plants (vegetation) which is supposed to be good for protecting the soil? Selected Answer: tilling results in loosened soil which is exposed to wind and rain, increasing erosion •
Question 24 1 out of 1 points What is the most important factor for forming soil Selected Answer: climate Sunday, December 31, 2023 5:28:35 PM CST