What are differences between coal and petroleum formation?

I got this question as home work. I search too much after that I found this: COAL: Coal forms in swampy areas as the result of the decay of plants in the absence of oxygen. read more

Whereas most Petroleum Formations have Matrix system and not as heavily influenced by production rate as Coal as. (This is main reason why Simulating Coal formation is difficult) 2) Rock Strength: Coal is extremely friable. Meaning apply a 10–20 psi and it will break. Think of a Biscuit. Whereas Petroleum Formation aren’t as weak as Coal. read more

All may be considered “fossil fuels”, but they differ in time and conditions of formation and chemical composition. Coal is a solid, oil is a liquid and natural gas is a vapor (gas). Coal and oil form from deposits of animal and vegetable matter deep in the ground at conditions of high pressure over many years. read more

Coal is formed by the remains of dead and decayed plants, while Petroleum is formed by the remains of dead and decayed animals and plants. read more