Unit 3; Energy & Env Pollution; Non-Renewable Resources
- Created by: Former Member
- Created on: 30-01-17 09:42
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- Non-Renewable Resources
- reformed over a long period of time
- Advantages
- high energy density; small amount releases a lot
- resources too exploit are large BUT hard to access
- Tech used is more developed than tech for renewabls
- Disadvantage
- Finite: reforming is too slow to replace what humans use
- environmental damage from extraction & combustion
- political tensions if countries have insufficient supplies
- prices will rise as deposits are depleted
- Oil & Natural Gas Formation
- heat & pressure drive out other substances, leaving carbon
- died, sunk, covered in silt, decayed anaerobically
- formed from aquatic organism remains
- Fossil Fuel Extraction
- Coal
- deep shaft mining more efficient but problem of drainage, subsidence & large machine use
- open cast mining affects more area but can't go as deep
- Crude Oil
- primary recovery
- extraction when oil comes to surface under natural pressure
- difficult to extract if deep, under water or viscous
- primary recovery
- Natural Gas
- forced to surface by natural pressuer
- Coal
- Nuclear Power
- environmental issues of radioactive waste
- very high energy density
- very little of what's mined is used
- fossil fuel inputs
- public opposition due to danger
- needs high tech level
- expensive construction
- less waste produced
- Types of Waste
- High: need vitrification & encapsulation
- Intermediate: shorter half lives
- Low: sealed in polythene bags
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