1) We get natural materials from animals, plants and rocks on the Earth.
There is a limit to Earth's resources.
2) Some materials are renewable. For example, we grow trees to obtain
wood and breed silkworms to obtain silk. However, this needs a lot of
time, effort and money.
3) Non- renewable materials such as petroleum, coal, natural gas and
metals cannot be obtained once they are used up. They can only be
obtained from the earth.
4) Altough man-made materials are not obtained directly from nature,
they are often produced from natural materials such as petroleum.
5) Natural materials and man-made materials are limited. They will be
used up if there is no effort to conserve them.
6) As such, we should conserve materials so that they would not be used
7) We can help to conserve materials by reusing, reducing and recycling
the things we use every day.
1) Reusing is an attempt to use thrown-away materials again for other
2) Instead of throwing things away, we can modify them so that they can
be used again.
3) This can help to reduce the amount of waste and save a lot of precious
4) Here are some of the things that we can reuse.
(a) Old newspapers can be used to wrap things. Old magazines and boxes
can be used to wrap presents.
(b) Pieces of old cloth can be used to wash cars or to mop floors.
Old tyres are used to decorate gardens.
Reducing The Use Of Materials
1) In order to conserve materials, we must reduce the use of natural materials.
2) Reducing the use of materials can help save production costs and reduce
the amount of waste.
3) Paper comes from trees. If we use a lot of paper, we need to cut down many
trees. Using less paper means saving trees. For example,
(a) write or print on both sides of a paper
(b) use handkerchiefs instead of tissue paper
4) Use baskets and food containers instead of plastic bags when shopping.
5) Avoid using disposable objects such as plastic spoons and forks,
polystyrene plates and cups, and wooden chopsticks.
plastic spoon and fork
1) Recycling materials is converting used and old materials into new products.
2) Materials that can be recycled are sent to collection centres for recyclable
materials or put into recycling bins.
3) The materials are then separated and put into different bins. These bins are
marked with recyclable symbols.
4) Materials that can be recycled are glass, paper, aluminium and plastic.
Brown - glass
Blue - paper
Orange - plastic and aluminium