Assertion: natural gas | /r/MadeOf | methane
Facets:
value: mainly
type: DEGREE
value: typically
type: DEGREE
Source sentences:
text: Natural gas (also called fossil gas; sometimes just gas), is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.
text: Natural Gas is a flammable gas, consisting mainly of methane (CH4), occurring in underground reservoirs often with oil.
text: Natural gas is a fossil fuel in gaseous state that consists mainly of methane (CH 4 ), and other forms of alkanes such as ethane, propane, n-butane, n-pentane etc., but also a very small percentage of CO2, nitrogen, hydrogen sulfide and even helium.
text: Natural gas is a colorless gaseous fossil fuel consisting of mostly methane and ethane—composed of hydrogen and carbon—and is also known as hydrocarbon.
text: Natural gas consists mainly of methane, the simplest hydrocarbon (organic compound that contains only carbon and hydrogen).
text: It’s colourless and consists mainly of methane, which is the simplest type of hydrocarbon.
text: It’s colourless and consists mainly of methane (CH4).
text: Natural gas is a colourless, odorless gas that burns easily (see flaring in Figure 1) and typically consists mostly (90% or more) of methane.  
text: Natural gas consists mostly of methane and hydrocarbons or ethane.
text: Crude oil or petroleum consists of hydrocarbons and other organic compounds while natural gas consists mostly of methane and hydrocarbons or ethane.
text: Natural gas consists of mainly methane and other hydrocarbons.
text: Natural gas, which primarily consists of methane, is the cleanest burning fossil fuel.
text: Natural gas, which consists mainly of methane (CH 4 ), can contain up to 20 percent of other gases—mainly ethane (C 2 H 6 ), and possibly propane (C 3 H 8 ), butane (C 4 H 10 ), pentane (C 5 H 12 ), carbon dioxide (CO 2 ), and nitrogen (N 2 ).