a. peat → accumulation of partially decayed vegetation or organic matter
b. petroleum → naturally occurring, yellowish-black liquid found in geological formations beneath the Earth's surface
c. natural gas → naturally occurring hydrocarbon gas mixture consisting primarily of methane
d. hydrogen → colorless, odorless, nonmetallic, tasteless, highly flammable diatomic gas
You may want to reference (Page 281) Section 6.10 while completing this problem.
Which fuel is not a fossil fuel?
c. natural gas
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