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Lecture 3

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Environmental Science
Carl Mitchell

Lecture 3 y A system is anything you make it One of the first things to realize is that the boundaries can be very fluid depending on what your question is or what your trying to get It can be an ant or a classroom or the world It really depends on the question you are going to ask but all systems have some sort of input that things happens in it and some sorts of output Biggest ones are energy and matter which form inputsy Open systems are open to matter y Isloated system is universey Closed system is closed to matter y Close system is open to matter y Open system is open to energy and matter y Open system example is a car You put gas in the car Gas is matter Gas fires up and makes the car goes and toxins are released in the air which is mattery OS in nature are normal Earth isnt OS It is a closed systemy We are open system we eat food release heat go to the bathroom Most ecosystem can be open or closed system y Isnt open to matter Matter is struck up at the top Hard to find in nature other than earth Most systems have matter coming from other interactions y All the matter stays within the smaller bomb and some energy is transferred to the water bath Contrast to mass losty These systems interact with one another y Negative feedback professor talking fast and you tell him to slow down When they are leading not off to one group y Positive feedback leads you to one extreme or the other You will snowball Throw a snowball down a hill it keeps going The bigger it gets the faster it roles and the more snow it picks up Where things get worse and worse in the environment This is bad in naturey NF keeps environment in good medium Example when your body gets hot or cold When you sweat you could cool down if energy from you goes in the air When you get could you shiver and then get warm These mechanisms kick in for humans NF is sometimes true if sometimes you have increase in temperature that could lead to evaporation of water which leads to greater cloud formation which blocks out solar radiation which brings temperature down and allowing less evaporation and less clouds y Example 1 when your in an area like Canada that gets snow coverage or in the arctic where there is sea ice Things warm up and ice melts Ice is very reflective it has high albeito The radiation from sun just bounces off and doesnt get absorbed Ice and snow sticks around because it is very reflective It will stay for long time because of that Even though its warm it takes awhile for it to go When it melts darker surfaces are exposed soil grass rocks They are darker and less reflective More absorption of energy and this makes more snow or ice melt and then even more darker surfaces are exposed and warm up and more melting and eventually arctic sea ice is gone
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