26.1 Conventional energy resources Pages 683 - 689
26.1 Conventional energy resources
Pages 683 - 689
Goal 1
Recognize the sun as the ultimate source of energy on
Earth
• Solar energy – Food– Producers
• Maintenance• Reproduction• Growth• Energy Storage
– Consumers • Eat producers • Use of solar energy stored in plants
• Solar energy– Fuel– Stored carbohydrates are burned– Exothermic– Releases energy as heat
Goal 2
Describe traditional sources of energy
• Wood– Oldest source– 4% of US households– 1.5 billion households worldwide– Deforestation
• Field Crops– Corn, hay, straw– Crop residues– Corn furnace
• Fecal material– Animal solid wastes– Dried and burned
Goal 3
Explain the formation of fossil fuels
• Fossil fuels– LONG time needed for formation– Decayed, compressed plant material
• Peat– Old, compressed sphagnum moss– Bog– 10,000 + years– Ireland, England– N. US
• Coal– Compressed organic material
• plants• peat
– Millions of years – High carbon concentrations
– Grades of coal• Low grade = lignite• Mid-grade = bitumous coal• High grade = anthracite
Image copyrighted by Kentucky Geological Survey and can be viewed at their website: http://www.uky.edu/KGS/coal/coalkinds.htm
• Petroleum and Natural gas– Phase 1 of formation– Accumulation of dead organisms in seas– Sediments bury and mix with the organisms– Decay occurs – Heat and pressure
– Phase 2 of formation– Overlain with non-porous rock
• Slate or Shale– Oil and natural gas migrate upwards– Pocket created at non-porous rock
• Fault or folds in rock layer– Natural gas a waste product of anaerobic
bacteria
Image copyright unknown, by LBR at UGA
Found at: www.petroleumworld.com
Thanks to the individuals who have generously shared images with the use of a creative
commons’ license.
Tommy the rabbit …. By broterham on FlickrCoal plant … by Bruno D RodriguesCampfire … by lord bute on Flickr
Corn furnace … Wisconsin corn burner llc.Dung … by Claude Renault on Flickr
Shelp lake bog … chickeninthewoods on FlickrSphagnum moss … by John Wesley Barker on
FlickrSphagnum moss close up by danteclaus on Flickr