Using resources

relay on earth resource to provide them with food,shelter ,warmth and transport all resources come from the earth crust,ocean and atmosphere which are renewable (timber ) or finite (metal ores)

they take care of it so the earth does become to polluted as population increases human relay on agriculture (the art and science of cultivating the soil, growing crops and raising livestock)to supplement or even replace such resources

naturally contains microorganism and dissolved salts but in order for us to drink this we need them to be at low levels for it to be safe enough for us to drink

water that is good quality and safe to drink

1) fresh water from a suitable source (river,lake away from polluted areas is collected 2) it is passed through a filter bed to remove solid particles

3) chlorine gas is added to kill harmful microorganism 4) fluoride is added to drinking water to reduce tooth decay

Ozone and ultraviolet can also be used to sterilize water to improve quality of water more dissolved substances can be removed by passing the water through a filter containing carbon ,silver and ion exchange resins

can be done if fresh water supplies are limited to produce pure water can be done by distillation or osmosis both process are very expensive and use a lot of energy

The water is boiled to produce steam the steam is condensed to produce pure liquid water

wasted by homes,agricultural process and industrial process the waste must be treated before it can be released back in to the environment

organic matter harmful organisms toxic chemicals

screening and grit removal sedimentation to produce sewage sludge and effluent anaerobic digestion of sewage sludge aerobic biological treatment of effluent

it is a good conductor of electricity and heat easily bent,yet hard enough to make waterpipes and tanks does not react with water so long lasting

when copper is extracted from copper-rich ores by heating the ores with a carbon furnace and then be purified by electrolysis

from solution of copper salt by electrolysis (positive copper ions move towards the negative electrode and form pure copper) displacement using scrap irons

low grade ores contaminated land by biological methods

uses plant to absorb copper as the plant grows they absorb and store copper the plant is then burnt and the ash produced contains copper in relatively high quantities

uses bacteria to extract metals from low grade ores a solution containing bacteria is mixed it a low grade ore the bacteria converts the copper into a solution known as a leachate solution from which copper can easily be extracted

metals corrode when they react with oxygen and water in the environment the term rusting is when an iron object or object containing iron corrode

painting electroplating greasing a metal object to stop oxygen and water from reaching the surface and therefore stop corrosion from occurring

more reactive metal is placed in contact with the metal EG-blocks of the more reactive magnesium metal are attached to the iron or steel object as magnesium is more reactive than iron it reacts and loses electrons instead of the iron

used too protect iron or steel projects the object is coated in a layer of zinc the zinc layer stops oxygen and water from reaching the metal and stops the corrosion if the surface of the zinc is scratched it does not matter the zinc provides sacrificial protection

by a thin layer of aluminium oxide which acts as a barrier and prevents the aluminum from reacting further

non-crystalline solid