Linked from
The 16 pages that link to Compost, each with the reason it gives.
ManureRelated: Composting manure reduces its volume and produces a soil amendment.
GardenRelated: It returns nutrients and organic matter to cultivated garden beds.
GardeningRelated: It returns kitchen and garden waste to growing beds as organic matter.
TopsoilRelated: Compost amendments add organic matter to cultivated topsoil.