Lecture - Sept. 17th
Lecture - Sept. 17th 11883 - GEO 105 - 01
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This 2 page Class Notes was uploaded by Andrea on Thursday September 17, 2015. The Class Notes belongs to 11883 - GEO 105 - 01 at Grand Valley State University taught by Tara Ann Kneeshaw in Fall 2015. Since its upload, it has received 54 views. For similar materials see Living with the Great Lakes in Geology at Grand Valley State University.
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Date Created: 09/17/15
Living with the Great Lakes Notes from class on September 17th 2015 Top Hat Review Questions from the previous notes 0 When did the first inhabitants arrived in the Great Lakes region 0 10000 years ago 0 The interior of the Earth consists of one layer material that has a uniform composition True or False 0 False Fundamental Geology Concepts 0 Internal Structure of Earth Review 0 Crust continental and oceanic I Continental 0 The basement floor of the crust underneath the soil and water 0 Granite composition which is made when lava cools a slow rate allowing crystals to form and grow No matter where you are 0 2025 miles thick before hitting the Mantle I Oceanic o Beneath the muckmud on the bottom of the ocean floor Completely different than continental o Basaltic composition which is made when lava cools faster Becomes dark and powdery o 4 miles thick until the Mantle I Mantle 1800 miles thick until reaching the Outer Core Subdivide into two parts 0 Upper Mantle o Closest to the crust o Composed mostly of Olivine o Cooler and harder rock than Lower Mantle 0 Lower Mantle 0 Somewhat similar to Upper 0 But has minerals that form under high pressures 0 Because it s closer to the Outer Core the temperatures are hotter and therefore the rock is a playdough like consistency I Core 0 Outer Core 0 Molten Extremely hot from heat rising from the Inner Core 0 Inner Core 0 Essentially during the Big Bang when the universe exploded like a huge bomb so large and unfathomably powerful to what we consider a big bomb that the Earth s core is still cooling from the explosion and is still radioactive o The core itself is mostly Iron and Nickel so densely packed that when earthquakes happen on the surface the waves that travel through the layers of the Earth immediately are ended when they reach the core They just can t travel through something like that because it is so dense 0 We need the core to continue to be hot and radioactive othenNise it could have extreme effects with the way out continents move and our Earth itself lives 0 Top Hat Review 0 Which layer of the Earth is approximately 1800 miles thick 0 Ingredients The Mantle o The building blocks of creating basically everything I Atoms gt Minerals gt Rocks gt Exploration gt Information 0 Mineral single element or compound Naturally formed lnorganic not living Example Wood is not a mineral But Bones are Which is why when a body decomposes only the bones are left gt Fossils Solid Crystalline structure atomically Example Pure sulfur is a yellow powder that smells like rotten eggs 0 Mineraloid Does not contain the crystalline structure Example Glass atomically looks very bloblike Not organized like crystals 0 Rocks Naturallv formed coherent mass of minerals mav include ordanic debris Example Granite contains 0 Quartz Hornblende and Feldspar 0 Top Hat Review 0 What is the correct definition of a rock 0 End of Class A solid cohesive aggregate of one or more minerals or mineral o Familiarize yourself with the 3 types of ways rocks can form lgneous Crystallization from magma Sedimentary Random debris such as sandsiltdust which can make rocks like sandstone Metamorphic Changes when exposed to heat and pressure