GEO 401 Lecture Exam 1 2023 with 100% correct answers

What is the age of our solar system? - correct answer -4.6 Ga In which layer of the earth could you most likely find O, S, Fe, Ni? - correct answer -Outer Core In which layer of the earth could you most likely find Fe, Ni? - correct answer -Inner Core In which layer of the earth could you most likely find O, Ca, Mg, Si, Al, Fe? - correct answer -Mantle Which part of the earth has a density of 8.0 g/cm^3? - correct answer -Core Which part of the earth has a density of 3.0 g/cm^3? - correct answer -Ocean Crust Which part of the earth has a density of 3.4 g/cm^3? - correct answer -Mantle Which layer corresponds to the Moho discontinuity? - correct answer -Lithosphere * In which layer is the geodynamo created? - correct answer -Outer Core In which layer does convection occur that drives plate motion? - correct answer -Mantle Which layer is completely liquid? - correct answer -Outer Core How do we know that the entire Earth is layered in this way? - correct answer -Geologists study seismic waves Which type of crust is typically thicker? - correct answer -Continental crust Which type of crust is less dense? - correct answer -Continental crust Which of the following could be considered as meeting the requirement to divide geologic time? A. the first appearance of a specific type of plant B. a mass extinction event C. the first appearance of oxygen in the atmosphere D. the first appearance of a major continental landmass E. all of the above - correct answer -E. all of the above What do geologists term the shape of the Earth, and what does it look like? - correct answer -Geoid The Earth's topography is measured from - correct answer -sea level In 1785, James Hutton, the father of modern geology, stated: "Before the present, land was made. A world existed, composed of sea and land, in which were tides and currents exist as now take place. And that while the present land was forming at the bottom of the ocean, the former land maintained plants and animals; at least the sea was then inhabited by animals, in a similar manner as it is at present." The statement is the principle of: - correct answer -uniformitarianism Hutton's principle is now accepted by a majority of scientists. It is a: - correct answer -theory If Hutton was to make a model of his theory, he would: - correct answer -draw a picture The force that drives the motion of tectonic plates is - correct answer -convection Geologist