(i) Compost: Substances converted into manure for use in agriculture

The biodegradable wastes like kitchen wastes can be dumped into a pit and can be converted into manure which can be used in agriculture. This is called compost and the process is called composting.

(ii) Landfill: Garbage buried under soil in an area.

The non-biodegradable garbage is taken to low lying areas called landfills and non-useful garbage is filled in pits dug in these landfills areas and covered with soil.

(iii) Recycling: Reuse of used material in the same or another form.

Recycling means separation of used materials and sending them to their respective cycling units to obtain new things from used products.