BIO120H1 Chapter 4: Bio Chapter 4.doc

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22 Apr 2012
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BIO120H1 Full Course Notes
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Chapter 4 variation in the environment: climate, water and soil (61-66, a; 67-70, b; 70-75, c; 75-78, a; 79-84, c) The earth is tilted 23. 5 on its axis. This means that the northern hemisphere receives more intense solar radiation during the northern summer and less during the northern winter. This tilt also means that the solar equator (area lying directly below sun"s zenith) varies seasonally; it is. 23. 5 n on june 21st and 23. 5 s on december 21. The northern hemisphere has less ocean area, meaning it has more temperature variance between seasons. At a given temperature, liquid water has a tendency to evaporate and water vapor has a tendency to condense back to liquid water. When these two tendencies are in equilibrium, it is called the equilibrium water vapor pressure. Equilibrium water vapor pressure increases with temperature, meaning warmer air can hold more water vapour.

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