Understanding Earth's Layers and Tectonic Processes Explained
School
University of Oregon**We aren't endorsed by this school
Course
ERTH 308
Subject
Geology
Date
Dec 9, 2024
Pages
1
Uploaded by eb27570
ERTH3081.What is the outermost layer of the Earth called? Do you take this for granted? Doyou feel bad about that after watching the film?The outermost layer of the Earth iscalled Continental Crust. It's easy to take it for granted and the video shows howbeautiful dynamic nature is and how we should appreciate it more.2.How old is the earth, according to this film? Do you buy it?The Earth is 4.5 billionyears old. I believe it because it is generally accepted by scientists as well who have doneexpansive research.3. Which is older, the continental crust or the oceanic crust? The continental crust isolder than the oceanic crust, which is constantly renewed at mid-ocean ridges.4.Where does the energy to drive Plate Tectonics come from?The energy drivingplate tectonics comes from heat within the Earth's interior. T he decay of radioactive elementscauses heat5.How much extension has occurred in the Basin and Range? How is this relevantto Oregon and the Pacific Northwest?The Basin and Range Province has stretched up to100% lateral extension of its own. This is relevant to Oregon due to its tectonic activity near thePacific Plate.6.What is a xenolith? Where do they come from, and how do they get to thesurface?A xenolith is a piece of rock trapped in magma from the mantle or deep crust andbrought to the surface during volcanic eruptions.7.What is underplating of the crust? Why do you think magma rising from themantle is likely to pause at the Moho, the boundary between the mantle and the crust?Underplating occurs when magma from the mantle accumulates at the base of the crust. It pausesat the Moho boundary due to density contrasts since there is not enough heat to push it all theway to the surface.8.Where does most of our knowledge of the deep interior of the Earth come from?Most of our knowledge of the Earth's interior comes from seismic wave studies.9.Erosion reveals granitic batholiths by stripping away the overlying crust. Whatkind of crustal rocks were removed from above batholiths?The crustal rocks that wereremoved consisted of large masses of igneous rock formations.10.Where do pillow lavas form?Pillow lavas form when molten lava flows into theocean, cooling rapidly when it makes contact with water. This quick cooling causes the lava toharden into distinctive, rounded, pillow-shaped formations.11.How much of Oregon is formed of exotic accreted terranes?Most of Oregon isformed of exotic accreted terrane.12.What is the goal or eventual result of erosion?The goal of erosion is to levellandscapes, eventually reducing them to plains.
