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by: Shayna Jenkins Sr.


Shayna Jenkins Sr.
GPA 3.84

P. Hesp

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About this Document

P. Hesp
Class Notes
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Popular in Geography

This 2 page Class Notes was uploaded by Shayna Jenkins Sr. on Tuesday October 13, 2015. The Class Notes belongs to GEOG 2051 at Louisiana State University taught by P. Hesp in Fall. Since its upload, it has received 11 views. For similar materials see /class/222738/geog-2051-louisiana-state-university in Geography at Louisiana State University.




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Date Created: 10/13/15
Physical Geography is The spatial analysis ofall the physical elements and processes that make up the environment A branch of Physical Geography is geomorphology the science oflandforms Earth System Concepts Systems Theory A SYSTEM is any ordered interrelated set ofthings and their attributes linked by flows off energy and matter The elements within a system may be arranged in a series or interwoven with one another A system comprises any number of sub systems Within earths systems both matter and energy are stored and retrieved and energy is transformed from one type to another NOTE MATTER is mass that assumes a physical shape and occupies space Systems in nature are generally not self contained Inputs of energy and come in outputs flow out M Open System Earth is an OPEN SYSTEM solar energy in heat energy out CLOSED SYSTEM A system that is shut off from the surrounding env so that it is self contained in a closed system rarely found in nature Earth is essentially a closed system in terms of physical matter and resources air water and other material resources OPEN SYSTEM photosynthesis and respiration SYstem feedback as a system operates it generates outputs that influence its own operations These outputs function as 39information39 this is returned to various points in the system via pathways called FEEDBACK LOPS feedback can control or guide further system operations EG an increase in sunlight for a plant lfthe feedback info discourages response in the system it is NEGATIVE FEEDBACK Such negative feedback causes self regulation in the natural system acting to stabilize and maintain the system If feedback info encourages increased response in the system it is called POSITIVE FEEDBACK EG a compound interest bearing account unchecked positive feedback in a system can create a runaway condition can reach a critical limit leading to instability or death System Equilibrium Most systems maintain structure and character over time A steadysatate system fluctuating around an average value systems tend to resist abrupt change however a system may reach a threshold at which it can no longer maintain its character and lurches to a new operational level major earthquakes


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