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Geology 105

by: YokiChanMan
University of Louisiana at Lafayette
GPA 3.95
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About this Document

These notes will cover the first half of chapter one notes of the first exam. I will upload the next half soon.
Ms. Boudreaux
Class Notes
Geology, Geological




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This 3 page Class Notes was uploaded by YokiChanMan on Sunday July 24, 2016. The Class Notes belongs to Geology 105 at University of Louisiana at Lafayette taught by Ms. Boudreaux in Summer 2016. Since its upload, it has received 45 views. For similar materials see in Geological sciences at University of Louisiana at Lafayette.

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Date Created: 07/24/16
Geology 105 Chapter 1 Understanding Earth ­a dynamic and evolving planet I. Dynamic– characterized by constant change, activity, or progress a. Earth subsystems  i. Atmosphere ii. Biosphere iii. Hydrosphere (69% fresh water) (glaciers) iv. Geosphere (affects all subsystems) 1. Lithosphere 2. Mantle  3. Core II. Introduction a. We study Earth as a system (we are part of it) b. We affect the system c. Our actions can cause wide ranging changes d. We need to understand how the various Earth systems work e. What’s geology? i. Comes from the Greek words “geo” (earth) and “logos” (study) ii. Study of the earth  f. Geology and the formula of theories  i. Scientific theory­ a well substantiated explanation of some aspect of the  natural world that’s acquired through the scientific method and repeatedly  confirmed through observations and experimentation ii. Plate tectonic theory iii. The rock cycle iv. Organic evolution v. Geologic time and uniformitarianism III. Scientific Method a. Accumulate observations b. Make one or hypothesis (possible explanations) c. Test the hypothesis by experiments or additional observations d. If one hypothesis is confirmed as the probable explanation then it is called a  scientific theory IV. Why study Earth? a. To understand our surroundings i. We’re part of it ii. If can’t be grown, has to be minded b. Predicting, controlling, avoiding geological hazards  c. Advancement of civilization i. Economics, politics d. Protects our environment  V. How does geology affect our everyday lives a. Natural events b. Economics and politics (oil and gas) c. Our role as decision makers d. Consumers and citizens e. Sustainable development VI. Global geologic and environmental issues facing humankind a. Overpopulated b. Global warming VII. Origin of the Universe a. Earth’s place  i. Big questions 1. What’s the origin of the universe? 2. What’s been its history 3. What is the eventual fate? 4. How common are planets around other stars 5. Is there life elsewhere? 6. Is life rare, unusual, or even unique b. Origin of the Universe i. Big bang theory model 1. 14 billion years old 2. Hot, dense, state, expansion and a less dense state 3. Evidence a. Expanding universe, radiation (afterglow) 4. Universe after expanded, cooled 5. Stars and galaxies formed and chemical makeup was changed by  matter given off as stars died ii. Solar nebula theory 1. Condensation and collapse of gas and dust in an arm of the milky  way galaxy  2. Cloud of dust material formed a counter­clockwise rotating disk  3. Material concentrated in center­formed the sun and surrounding  solar nebula 4. Rotation within solar nebula formed localized eddies when  material concentrated into *planetesimals* that eventually formed  planets iii. The differentiation of early Earth 1. Early earth probably had a uniform collision and density  throughout 2. The temperature of early Earth reached melting point of iron and  nickel VIII. Why’s Earth a dynamic planet? a. The core i. Solid inner ii. Liquid outer iii. 16% of Earth’s volume


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