This type of swamp is normally called a peat bog.
A bog.
It is called a moor.
Bog.
This type of swamp is normally called a peat bog.
Peatbog.
A rock consisting chiefly of calcium carbonate or carbonate of lime. It sometimes contains also magnesium carbonate, and is then called magnesian or dolomitic limestone. Crystalline limestone is called marble.
humus
it decomposes
causeway
Decayed organic material in soil is called humus. Humus is rich in nutrients and helps improve soil structure, fertility, and water retention.
Marsh or Marshland
IIt is called organic matter.