Natural Gas:  
A hydrocarbon gas mixture consisting primarily of methane and other carbon based gasses like ethane/ethylene and propane/propylene.


Market Dynamics:

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:

Crude oil

Frack-ed Oil Wells are particularly rich in natural gas
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Down Stream Materials Consuming Natural Gas:

Acetic Acid

Acetone

Ethylene

Isopyropyl Alcohol (IPA)

Methanol

Propylene

Various polymers that are ethylene/propylene based