Learning Task No. 4. : Identify the following changes that will happen in the materials in each activity or situation. Tell whether they are useful or harmful in the environment.

1. cutting of trees
Useful in the environment
Harmful in the environment

2. shaping of wood to make furniture
Useful in the environment
Harmful in the environment

3. hammering/shaping iron to make bolo
Useful in the environment
Harmful in the environment

4. burning of old tires
Useful in the environment
Harmful in the environment

5. shredding paper for paper mache
Useful in the environment
Harmful in the environment

6. cooking of food
Useful in the environment
Harmful in the environment

7. throwing detergents into the sewage
Useful in the environment
Harmful in the environment

8. killing animals in the forest
Useful in the environment
Harmful in the environment

9. sewing fabric to make clothes
Useful in the environment
Harmful in the environment

10. dumping garbage into the river
Useful in the environment
Harmful in the environment