Please enable JavaScript.

Coggle requires JavaScript to display documents.

choosing best materials (uses of different materials (should material be…

- - - - forests are cut down to produce paper
        
        when we lose forests, we lose many animals and plants that live there
      - our excessive use of paper has led to increase in paper production
        
        paper production uses alot of energy and water
        
        contributes to water and air pollution
        
        cutting down on use of paper can lead to smaller environment can lead to smaller environmental impact due to paper production
        
        pg 59
    - - useful materials because they do not breakk down easily
        
        bad when it comes to environment
        
        apart from damaging environment, may also use up earth's limited resources when use too much paper and plastics
        
        every year, more and more of earth's forests are lost to produce paper
        
        oil is used to make plastics and they may run out in 50 years or less
        
        if we are not careful, we may run out of them one day
        
        most plastics dont decompose in soil
        
        non biodegradable
        
        can take hundreds of years to break down
      - those which ends up in sea kills many animals each year
  - - - means using less. when use less, we conserve resources
      - eg using both sides of paper when writing and using own shopping bags instead of plastic bags
    - - using things again instead of throwing them away
      - eg, old clothes can be donated to needy
      - eg, old jars can be reused to store things
    - - using old things to make new things
      - materials that can be recycled include glass, metal, paper, and some plastics
      - waste paper is made into cardboard, tissues and writing paper
      - plastic, glass, metal can be melted down and made into new stuff
- - - - clay has been used for thousands of years to make cooking pots, plates and containers for water
      - clay still widely used today
      - apart from clay, scientists are developing many new kinds of ceramics with useful properties
        
        used to replace other materials esp metals
        
        pg 58 for picture and captions