Answer:
The three main factors are :-
1. Heat
2. Pressure
3. Time
Step-by-step explanation:
Coal oil gases are the fossil fuels these are formed from the dead organisms inside the earth. fossil fuels are non renewable. Coals are formed due to dead plants. When the plants and other material is goes inside the earth then at high temperature & pressure these plants are turned into fossil fuel. Thus high temperature & pressure are the main cause of dead organisms turned into fossil fuels.
Thus the three main factors are :-
1. Heat
2. Pressure
3. Time
1. Heat :- Heat is the main factor that causes to turn the remains of dead organisms into fossil fuels. Because due to heat at longer time the dead organisms turned into fossil fuel.
2. Pressure:- inside the earth surface pressure is high. so due to high pressure the dead organisms turned into fossil fuel.
3. Time:- Time is other important factor that cause this type of change. to convert dead organisms in to fossil fuel we have to take these organisms at high pressure & temperature for a longer time. then these organisms convert in to fossil fuels.