C14/15 - Earth's Resources
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What do humans use resources for?
Warmth shelter food
What are finite resources?
Resource that will run out
What is sustainable development?
Development that meets the needs of the current generation without compromising the ability of future generations to meet their own needs
Given an example of a natural product that has been replaced by a synthetic product
Cotton has been replaced by polyester
What is potable water?
Water that is safe to drink
In the UK how is potable water produced?
Passing fresh water through filter beds and sterilising
How is water sterilised?
Using chlorine ozone or ultraviolet light
What is desalination?
Removal of salt from sea water
In what two ways can desalination be carried out?
Reverse osmosis or distillation
What is the main disadvantage of desalination?
Requires a large amount of energy
In what kinds of locations is desalination carried out?
Where there is limited supply of fresh water
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 is sewage treated?
Screening sedimentation, anaerobic digestion, aerobic biological treatment
What is a life cycle assessment?
A way of assessing the environmental impact of a product across its entire life cycle
What are the four stages in a product’s life cycle?
• Extracting and processing raw materials 2. Manufacturing and packaging 3. Use and operation 4. Disposal and distribution at each stage
Why is it important to reduce use recycle and reuse products?
Reduces the use of limited resources energy sources and environmental impacts
Give an examples of a product that can be reused
Glass
Give an example of a product that can be recycled
Metal
Name two types of glass
Soda-lime glass and borosilicate glass
How are clay ceramics made?
Shaping wet clay and heating in a furnace
What is a composite?
A material made of two materials
Generally what are the two types of materials in composites?
A matrix and a reinforcement (normally fibres or fragments)
Give an example of a composite
Reinforced concrete plywood