Like the millipedes, centipedes are highly segmented (15 to 177 segments), but with only one pair of walking legs per segment (millipedes have two legs per segment). The head of a centipede has a pair of antennae, jaw-like mandibles (called forcipules) and other mouthparts.
Although compressed natural gas (CNG) is a fossil fuel like diesel, gas and coal, it is far different in terms of its impact on the natural environment.
In America, nearly 100% of the natural gas used in CNG applications is domestically produced. Natural gas comes from subterranean wells called shale plays. The shale rock creates a solid layer that traps methane, the principal component to natural gas fuel. Once drillers tap into the shale plays, the natural gas is pumped to the surface where it is cleaned, dried, and compressed to become CNG. Natural gas dispensed for fuel is measured by a Gasoline Gallon Equivalent (GGE).