ERSC 181 Week 8 Final Exam 2023 – Review Questions and Answers

ERSC 181 Week 8 Final Exam 2023 – Review Questions and Answers. The Precambrian Era is the time before abundant multicellular life with hard parts evolved. This time interval represents what percentage of earth's history? 99% 12% 88% 1% 50% Question 5 2/2 points When the radiometric clock starts ticking in zircon minerals, there is only 100% of the unstable radiometric parent isotope X and 0% of the stable daughter isotope Y. After testing in a lab millions of years later, there is 25% of the parent radiometric isotope and 75% of the daughter isotope. How many half lives have elapsed? 1 0.25 3 2 0.5 Question 6 2/2 points In the scientific method, a hypothesis is _______, and a theory is _________. an educated guess ; a law that has been universally accepted by the scientific community an objective observation ; an idea that hasn't been proven an educated guess ; a tentative untested explanation a tentative untested explanation ; well tested and widely accepted explanation a tentative untested explanation ; a law that has been universally accepted by the scientific commuQuestion 7 2/2 points In terms of groundwater resources, what properties make the best aquifer? High porosity and low permeability Low porosity and low permeability High porosity and no permeability Low porosity and high permeability High porosity and high permeability Question 8 2/2 points James Hutton's statement that "the present is the key to the past" (uniformitarianism) is demonstrated by ________. ancient sedimentary rocks formed by similar processes as are observed today the fact that our human ancestors hunted dinosaurs for millennia the volcano that erupted last year on August 15 will occur every 10 years on that date the Earth's landscapes are fixed and have not changed gravity being a recent phenomenon and not changing metamorphic rocks in the past Question 9 2/2 points Applying the principles of relative age-dating to the diagram, which of the following is TRUE. Explanation of the diagram: "A" represents an unconformity (erosional surface), "B" is a basaltic dike, "C" is a shale formation, "D" is a sandstone formation, "E" is a limestone formation, "F" represents a thrust fault.