Using Recources Flashcards
What do humans use the earths recources for
Warmth
Shelter
Food
Transport
What do natural recourses supplemented by agriculture provide
Food
Timber
Clothing
Fuel
What is sustainable development
Development that meets the needs of current generations without compromising the ability of future generations to meet their own needs.
What makes water safe to drink
Low levels of dissolved salts and microbes
Is potable water pure and why
No
Contains dissolved substances
How is most trash water made potable
Choosing apropriate source of fresh water
Passing water through filter beds
Sterilising
What sterylising agents are used for potable water
Chlorine
Ozone
UV light
What happens when supply’s of fresh water is limited
Desalination of salty water or sea water
How is sea water made potable
Distilation
- boiled till evaporation
Reverse osmosis
What needs to be removed from sewage and agricultural waste water
Organic matter and harmful microbes
What needs to be removed from industrial waste water
Organic matter and harmful chemicals
How do we treat sewage water
Screening and grit removal
Sedimentation to produce sewage sludge and efffluent
Anerobic digestion of sewage sludge by bacteria
Aerobic biological treatment of effluent
What are the two new ways of extracting copper from low grade ores
Phytomining
Bioleaching
What is phytomining
Plants planted somewhere with ores
Absorb metal compounds
Harvested and burnt
Ash contains metal compound
What is bioleaching
Bacteria produce leachate solution
That contains metal compounds
What are the four stages of a life cycle assessment
Extraction
Manufacturing and packaging
Use own operation
Disposal
How can glass bottles be reused
Crushed
Melted
Different glass products
How can metals be recycled
Melting them
Reforming into new products
What is corrosion
The destruction of materials by chemical reactions with substances in the environment
What is rusting
When iron corrodes
Water and air must be present
How can corrosion be prevented
Apply a coating as a barrier
Some may be more reactive and act in a sacrificial way
What can be used to coat a metal
Grease
Paint
Electroplating
What is aluminiums coating
Oxide coating
What is bronze and alloy of
Copper and tin
