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You live in Pasadena, Texas and have reason to believe a pipeline runs under your back yard. The density of the soils in your area is about 2.4 g/cc. The density of air is nearly 0.0 g/cc, the density of oil is 0.75 g/cc and the density of water is 1.0 g/cc. For this problem assume that the density of the pipe is the same as the density of the soils and that the pipe is 1 meter in diameter.
A geophysicist brings a gravimeter to your back yard and makes a series of measurements. He obtains the following results: