2020 Flashcards
(14 cards)
What is methanes mean residency time
12 years
How can cfcs be reduced (atmospheric concentration)
Substituted eg using hand pump action instead of an aerosol
What global warming potential does co2 have relative to co2
1
What gas has the lowest residency time in the troposphere
Ozone
What are the factors of sea level rise
- glacial melt
- sea level rise
- less land water storage
What are the remote sensing systems for antarica’s ice volume
- Grace (gravity recovery and climate experiment) by nasa
- satélite altimetry
What are the methods used to locate ore deposits
- trial drilling (rock samples) for presence and concentration
- remote satellite sensing (magnetometry)
- gravimetry shape and density
- seismic surveys (sound wave reflection) of the shape, depth and density
What methods reduce the radiation dose of workers exposed to radioactive materials
- minimise expositure time
- remote handled machinery
- minimum distance from the source
- using radioactive detection equipment
- decontamination processes
- wearing protective absorbing material
New technology for lower grade ore extraction
- bioleeching
- phytomining
- iron displacement
- leachate collection
- polymer adsorption
How does bioleeching reduce environmental impacts of mining
- less energy intensive than smelting
- reduced global warming (acid rain)
- reusing bacterial population
How does phytomining reduce environmental impacts of mining
- less energy intensive than smelting
- reduced global warming (acid rain)
- decontaminated the polluted ground
How does iron displacement reduce environmental impacts of mining
- less energy intensive than smelting
- recycles scrap metal
How does leachate collection reduce environmental impacts of mining
- makes use of spoil heaps
- reduced leachate draining problems
How does polymer adsorption reduce environmental impacts of mining
- reuses waste from aquaculture
- less equipment needed (less emissions)
