2. Nitrogen= 78% Oxygen=21% CO 2 =0.035% Total= 99.999%

3. http://earthguide.ucsd.edu/earthguide/diagrams/atmosphere/index.html Atmospheric composition

5. Point Source Non-Point Source

6. Primary Pollutants:  Directly release to the atmosphere  Eg: carbonmonoxide Secondary Pollutants:  Forms after chemical reaction  Eg: ozone Clean Air Act, 1970 Environmental Protection Agency (EPA)  National Ambient Air Quality (NAAQ)  Primary standard: to protect public health  Secondary standard: to protect public welfare

7.  Carbon monoxide (CO)  Lead (Pb)  Nitrogen dioxide (NO 2 )  Particulate Matter (PM)  Sulfur Oxides  Ozone

10. To understand how sulfur dioxide affects plants To be able to explain why sulfur dioxide pollution affects some plant species more than others

13. Effects on Human  Respiratory illnesses  Heart disease  Lungs diseases  Premature death Reduces visibility Crops Changes soil Makes lakes and streams acidic and unsuitable for fish Changes ecosystems over time

14. Damage the plant species (Mesophyll) Damages forests Acid rain Accelerates the decay of building materials and paints, including irreplaceable, monuments, statues, and sculptures that are part of our nation's culture heritage

15. In 2002, the highest SO2 in DFW was 0.018 ppm (the 24 hr standard is 0.145 ppm) Chicago and Pittersburgh: 3.2ppm For more information, check out the EPA's http://www.epa.gov/air/urbanair/index.html www.dallasair.com

17. Bonus Question: I took soil sample from the agricultural field and analyzed through various sieve. I got the following results. So which type of soil is it? If; Clay=10 gram Silt=20 gram Sand=20gram