'More than half of sedimentary rock is this type from which oil & natural gas can be obtained'
shale
ROCK: More than half of sedimentary rock is this type from which oil & natural gas can be obtained
More than half of sedimentary rock is this type from which oil & natural gas can be obtained
More than half of sedimentary rock is this type from which oil & natural gas can be obtained
ROCK
shale
ROCK