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Describe the following types of rocks
i) Calcareous rocks
ii) Carbonaceous rocks

Answer Text:
i)- They are sedimentary rocks which are formed from the hard parts of shells/skeletons of Marine. The rocks are rich in calcium.
ii)- Are sedimentary rocks which are formed from the remains of plants that were
buried deep in many years. The plants are transformed into rock because of pressure of crystal rocks and resultant heat and they are rich in coal.