Peat

This photo show workers who have dug down to a layer of peat, and have them dug out rectangular blocks of peat to be dried and used as fuel.

Peat is a type of soil that forms in bogs and and consists of decaying vegetative matter. It is acidic, and useful in gardening. Other uses include as a building material and as a fuel source.

Well preserved human remains thousands of years old have been found in peat.