peat is soft and the others aren't
Peat is usually brown to black with visible plant matter and a damp, earthy, crumbly texture.
lignite
Lignite
Steps in formation of coal 1. Dead organic matter forms peat. 2. Peat is compressed and water is forced out. 3. Pressure compresses the material into "soft" coal. 4. Higher temperatures and pressure form "hard" coal.
Millions of years ago, large areas of the Earth's land area were covered in dense peat swamps. Over time, the peat in the swamps was buried, and forced deep underground. Extreme pressure and heat eventually turned the peat into soft coal, and later some if that became hard coal also as a result of heat and pressure.
It is spelled peat moss and it is a moss which is a small, soft plant.
Peat wax is a hard, waxy material that comes from peat. It is used to prepare molds. It may also be found in some plastics.
This type of swamp is normally called a peat bog.
This type of swamp is normally called a peat bog.
A bog.
Hard