the environments of something can be used to identify that something & a bicycle mud line is a mean of physical public ->  a substance 's boiling point can be used to identify the substance  a substance 's boiling point can be used to identify the substance & land is a mean of soccer ->  the boiling point of water can be used to identify water  the boiling point of water can be used to identify water & land is a mean of soccer & the evolution line of land is 100c -> if a substance has a boiling point of 100c, then that substance is water