This is how fossil flues are formed.
Step 1: Peat
Peat is the top layer. It is the part where all of the living organisms live and die.
Step 2: Lignite
is the middle layer it gets reel hot in this area.This will compress and heat then compress than heat then it will continue this step till it forms coal .
Step 3: Coal
coal is the mineral that you find when you mine coal .Coal can be used in many ways .