Recognize that there are many very small organisms which can cause decay. In the ezone we look for evidence of natural materials e.g. leaf litter, grass cuttings which are decaying. Contrast with other waste materials that do not decay. The children identify things which decay and consequences if materials do not decay e.g. rubbish piles up. We explore that micro-organisms grow and that they feed on the material causing it to decay.
Can be linked in with Composting.