These were really the deposits of plants or animal matter that were made eons ago mainly marine matter, that over time because of decomposition have resulted into the current fossil fuels.
ये वास्तव में पौधों या जानवरों के अवशेष थे जो समुद्री पदार्थ के साथ दब गए और समय के साथ विघटन के कारण वर्तमान जीवाश्म ईंधन हो गए हैं।