There are many changes that materials undergo which may be useful to the environment. Which of the following changes are not useful to the environment?
1.Using both sides of the bond paper when writing.
2.Composting of decaying materials to produce organic fertilizers.
3.Using organic pesticides in killing insects.
4.Cutting down trees to make furniture.
1.Using both sides of the bond paper when writing.
2.Composting of decaying materials to produce organic fertilizers.
3.Using organic pesticides in killing insects.
4.Cutting down trees to make furniture.
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Answer:
4
Explanation:
Cutting trees may cause land slide, flood slide and lack of oxygen.
Answer:
changing liquid to gas