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Geography 1111

Geography 1111 - PhysicalGeography System set of...

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Physical Geography August 18, 2008 System: set of interrelated components that exchange energy and matter (some kind of commodity) Energy: the ability to accomplish work Matter: stuff, substances made up of molecules and atoms Open system: there’s a system, but matter and energy go in and out… [Lake is receiving water and soil all the time, also losing water all the time by evaporation/drainage. There’s a flow from the system and the environment around it. Pretty much all systems are open]. “What goes in, goes back out” Closed system: there is NO exchange of the substance in question with the surrounding environment. That’s pretty hard to accomplish in the “real world” [on a global scale, the earth’s atmospheric system is ALMOST closed. Sometimes we get rocks/meteors from outside. Occasionally really light hydrogen and helium escape the gravitational attraction to earth] Equilibrium: inputs=outputs. A balance [a lake would be as long as the rain that comes in from the hills is the same as the amount that evaporates].
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