Info about Coal

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What is coal

What is coal? Coal is rock formed from death plants. Coal takes a lot of time to form, about million of years. it is a rock extremely inflammable, so it is used as a fuel. It has a lot of energy, and because it takes so much time to be formed it is not considered a renewable energy source. The coal energy is in fact the energy that the plants have inside of them, and took it from the sun. After lots of weather changes the plants suffered some modifications, so in time they turn into coal. All the energy stored in these plants from the photosynthesis process, after they turn into coal, is kept inside of it. You can find coal inside the earth, sometimes at depths quite large. As deep is