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Chapter One: Introduction to Natural Disasters .

by: Lauren Sadowski

Chapter One: Introduction to Natural Disasters . GLY125

Marketplace > University of North Carolina - Wilmington > Science > GLY125 > Chapter One Introduction to Natural Disasters
Lauren Sadowski
Natural Hazards
Dr. Nooner

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About this Document

This is only chapter one; there are four chapters on the next test. The next test is on October 9th. I will have all of the information and study guide posted before then.
Natural Hazards
Dr. Nooner
Class Notes
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This 3 page Class Notes was uploaded by Lauren Sadowski on Friday September 25, 2015. The Class Notes belongs to GLY125 at University of North Carolina - Wilmington taught by Dr. Nooner in Fall 2015. Since its upload, it has received 19 views. For similar materials see Natural Hazards in Science at University of North Carolina - Wilmington.


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Date Created: 09/25/15
GLY 125 Natural Disasters Keller Natural Hazards Earth39s processes as hazards disasters and catastrophes Fourth addition Chapter One Introduction to Natural Hazards 11Why studying natural hazards is important Natural hazards are caused by our planet even though human actions can affect the planet which we will discuss in later chapters and effect human lives every day around the world It is important to study the hazards to understand the events and to prevent prepare for them Processes internal and external Process means the physical chemical and biological way that a hazard affects the Earth39s surface The internal processes are explained by the theory of plate tectonics Tectonic plates are large building blocks of rock and other minerals that rest on top of the molted rock in the inner earth External forces are things such as wind and water evaporation that affect the hydrologic cycle Events like earthquakes volcanoes oods and res are processes that occur naturally and have been since the birth of Earth These processes are only hazardous when humans get in the way Hazard disaster or catastroohe Natural hazard is a natural process that is potential life threatening to humans Disaster is a hazardous event that occurs over a limited time and 1 10 or more people are dead 2 100 people or more are affected 3 A state of emergency is declared Or 4 International assistance is asked for Catastrophe is a massive disaster that requires signi cant expenditure of money and a long recovery period In the last several years natural disasters have killedharmed and affected millions of people not even mentioning the cost of damaged properties but does that mean the disasters are getting worse Well no disaster is the same and sometimes the disasters are worse example hurricane sandy however we have to remember that the population of humans has risen dramatically in the last century That means there are literally more people to be killed The number of killed also depends on the location Example An earthquake would kill more people in a third world country than in California or Japan because California and Japan are use to earthquakes and have built their buildings and lives to withstand earthquakes Thankfully technology and scientists are continuing to develop better warning systems disaster preparedness and sanitation following the disaster Death and damage caused bv natural hazards Loss of life from earthquakes can vary from year to year Because the population of humans continue to increase especially in high risk areas we can expect the number dead or affect to continue to rise with the population An important part of disasters is their ability to turn into a catastrophe Let me explain the difference A earthquake hits California 200 people die thousandths are injured but that39s not all Those people with minor cuts and scrapes now get infections and diseases from being around other sick and dead people What started out at 200 people dead from the earthquake turns into 500 people dead from earthquakeinfectiondiseasesfamines Now of course this does not happen often in the US but it could easily happen in other areas around the world Disasters are affected by us Yes us Actions such as farming change the land the plants that grow on the land the way that water runs across the land and essentially changes the land Trees on the coast are a good thing because naturally they protect the land from tsunamis however people remove the trees to build houses hotels and other resorts Now when the tsunamis hit water travels many miles and affects more people and land because of the absence of trees 12 role of historv in understanding hazards A fundamental principle for understanding natural hazards is that they are repetitive events and will continue to occur 13The oeolooic cvcle The geologic cycle is a continuous process that makes the earth s mineral water and atmosphere This includes the tectonic cycle the rock cycle the hydrologic cycle and the biogeochemical cycle Tectonic cycle refers to the large scale geologic processes that form and break down landforms like the ocean basins continents and mountains The rock cycle is the largest cycle because it is linked to other cycles There are classi ed into three different types of rock igneous sedimentary and metamorphic rocks Sedimentary rocks are created by small minerals like sand that are compress under high pressure and form rocks Igneous rocks are created by the combination of heat and pressure and metamorphic rocks are made from lava or magma The hydrologic cycle is the movement of water The biogeochemical cycle is the recycling of chemicals through the atmosphere 14Fundamental Concepts for understanding Natural Processes as hazards The ve concepts are Science helps us predict hazards Knowing the hazard risks can help people make decisions Linkages exists between natural hazards Humans can turn disastrous events into catastrophes Consequences of hazards can be minimized P PWF The online homework with the class helps To prepare for the exam study the homework


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