関連ワード:
is coal a detrital sedimentary rock is coal a chemical sedimentary rock is coal a organic sedimentary rock is bituminous coal a detrital sedimentary rock coal is a detrital clastic sedimentary rock is bituminous coal a chemical sedimentary rock is coal a clastic organic or chemical sedimentary rock coal is classified as a chemical sedimentary rock is coal an example of a chemical sedimentary rock is coal always an organic sedimentary rock
