- Understand factors that cause changes in materials.
- Identify whether changes in materials are reversible or non-reversible.
- Explain the good and bad effects of changes in materials to the environment.
Physical change and chemical change
reversible: can change back
non-reversible: can't change back
decompose, biodegradable material
reversible: can change back
non-reversible: can't change back
decompose, biodegradable material