A hydrocarbon gas mixture consisting primarily of methane and other carbon based gasses like ethane/ethylene and propane/propylene.
The US Natural Gas market/price is primarily dependent upon climate/temperature. During the colder months, the price of natural gas goes up due to demand for heating homes and businesses. Further, some manaufacturing that uses natural gas as a raw material (ammonia/methanol/acetic acid) will go down for maintance while the price for natural gas is high.
Up Stream Materials/Building Blocks:
Frack-ed Oil Wells are particularly rich in natural gas
Down Stream Materials Consuming Natural Gas:
Various polymers that are ethylene/propylene based