ERSC 181 WEEK 8 Exam Questions and Answers 2023 – all Correct

ERSC 181 WEEK 8 Exam Questions and Answers 2023 – all Correct. The number one factor causing landslides is (are) _____.  A. precipitation  B. volcanic eruptions  C. earthquakes  D. glaciation  E. freeze-thaw cycles Question 4 of 50 2.0/ 2.0 Points Shield volcanoes consist of _________.  A. Mostly low viscosity basalt flows with a lower silica content.  B. A combination of granitic lava and pyroclastic material with some rhyolite.  C. Explosive pyroclastic material and low viscosity lava flows.  D. Alternating layers of silica-rich rocks and intrusive igneous rocks such as basalt.  E. Alternating layers of cinders and ash embedded in silica-rich lava flows. Question 5 of 50 2.0/ 2.0 Points Pyroclastic flows are more associated with __________.  A. stratovolcanoes  B. flood basalts  C. cinder cones  D. ocean hot spots  E. shield volcanoes Question 6 of 50 2.0/ 2.0 Points In the scientific method, a hypothesis is _______, and a theory is _________.  A. a tentative untested explanation ; a law that has been universally accepted by the scientific community  B. an objective observation ; an idea that hasn’t been proven  C. a tentative untested explanation ; well tested and widely accepted explanation  D. an educated guess ; a law that has been universally accepted by the scientific community  E. an educated guess ; a tentative untested explanation Feedback: 01.1 Question 7 of 50 2.0/ 2.0 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?  A. 1  B. 3  C. 2  D. 0.25  E. 0.5 Question 8 of 50 2.0/ 2.0 Points What evidence did Alfred Wegener use for his hypothesis of continental drift?  A. earthquake patterns and GPS measurements  B. paleomagnetic patterns on either side of the mid-oceanic ridge  C. mid-oceanic ridges and the age marine rocks  D. similar rocks and fossils on distant continents  E. trenches and subduction zones Question 9 of 50 2.0/ 2.0 Points The map below shows continental land as green and brown, the depth of the ocean floor in blue, and tectonic plate boundaries as colored lines. Evaluate this geologic evidence to determine which location would most likely require adequate tsunami preparedness.  A. A  B. C  C. D  D. B Question 10 of 50 0.0/ 2.0 Points Which of the following is the most significant natural cause of climate change in the last 2 million years?  A. Milankovitch cycles  B. Volcanic eruptions  C. Solar flares  D. Burning of fossil fuels  E. Photosynthesis Question 11 of 50 2.0/ 2.0 Points Which best explains the processes at the mid-oceanic ridge?  A. Plates converge destroying old crust  B. Plates converge creating new crust  C. Plates slide past each other destroying old crust  D. Plates diverge creating new crust  E. Plates diverge destroying old crust Question 12 of 50 2.0/ 2.0 Points Where do we generally find the most quantity of explosive volcanic eruptions?  A. Divergent plate boundary  B. Transform plate boundary  C. Subduction zone boundary  D. Mid-oceanic ridges  E. Ocean island hotspots Question 13 of 50 2.0/ 2.0 Points James Hutton’s statement that “the present is the key to the past” (uniformitarianism) is demonstrated by ________.  A. the fact that our human ancestors hunted dinosaurs for millennia  B. ancient sedimentary rocks formed by similar processes as are observed today  C. gravity being a recent phenomenon and not changing metamorphic rocks in the past  D. the volcano that erupted last year on August 15 will occur every 10 years on that date  E. the Earth’s landscapes are fixed and have not changed Feedback: 01.3 Question 14 of 50 2.0/ 2.0 Points The primary basis for classifying detrital (clastic) rocks is _______, whereas the primary basis for classifying chemical rocks is ________.  A. particle shape ; trace elements  B. rock type ; rounding  C. sorting ; density  D. crystalline structure ; sorting