Peat is an accumulation of partially decayed vegetation matter. Peat forms in wetlands or peatlands, variously called bogs, moors, and mires.

Peat forms when plant material, usually in marshy areas, is stopped from decaying fully by acidic conditions. It is composed mainly of peat moss or sphagnum, but may also include other marshland vegetation: trees, grasses, fungi, as well as other types of organic remains, such as insects and animal corpses.

Peat is a cheap fuel source. Its rather high water content means it does not burn terribly well or very hot, but it is an alternative to wood.

When peat is compacted, dried, and aged underground it eventually turns into coal.


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