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Unformatted text preview: 1. Shows relationships between population size and regional resource availability a. US PhD = 172 people/square km or 445/square mile b. Egypt PhD = 2580/sq. km or 6682/sq. mi 2. Comparing PhD to AgD indicates the carrying capacity (K) of land a. Also reveals relationships between a countrys population and its resources b. Large PhDs vs. small ArD indicates large population in a small land area 3. The Biosphere a. Is a closed system, except for light which allows for photosynthesis and heat i. Includes the atmosphere to a high altitude and land surface down to 3000 meters below the surface, to allow for H2O-bearing rocks b. Consists of two environmental components: i. Abiotic 1. inorganic, non-living ii. Biotic 1. organic, carbon-based c. Global Ecosystem i. The sum of all the planets ecosystems...
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- Spring '08