Waste Materials

1. Waste is any material that is no longer useful.
2. In their daily activities, people dispose many types of waste, including used paper, empty packages and food leftovers.
3. Waste materials can be divided into three types.
a) Solid waste such as glass, wood, paper, plastic, metal and food leftovers.
b) Liquid waste such as oil, detergent, chemical waste and sewage.
c) Gaseous waste such as vehicle smoke, cigarette smoke, pesticides and toxic gases.
4. Waste materials come from various sources.

Bahan Buangan

1. Bahan buangan ialah sebarang benda yang tidak berguna lagi.
2. Setiap hari,manusia membuang pelbagai jenis bahan buangan termasuklah kertas, bungkusan kosong dan sisa makanan
3. Bahan buangan boleh dibahagikan kepada 3 jenis
a) Bahan buangan pepejal seperti kaca, kayu, kertas, plastik, logam dan sisa makanann.
b) Bahan buangan cecair seperti minyak, detergen, bahan buangan dan kumbahan.
c) Bahan buangan gas seperti asap kenderaan, asap rokok, racun perosak dan gas toksik.
4. Bahan buangan datangnya daripada pelbagai sumber.