91. What is the process of converting natural gas into a liquid form by cooling it to very low temperatures called?
a) Liquefaction
b) Vaporization
c) Gasification
d) Condensation
92. Which gas is responsible for the formation of tight oil, a type of unconventional oil trapped in impermeable rocks?
a) Oxygen
b) Carbon dioxide
c) Methane
d) Nitrogen
93. What is the term used to describe the process of converting biomass into a gas-like fuel through heat and partial combustion?
a) Biomass gasification
b) Biomass liquefaction
c) Biomass pyrolysis
d) Biomass conversion
94. Which country is the largest consumer of natural gas in the world?
a) United States
b) Russia
c) China
d) Saudi Arabia
95. What is the process of removing impurities, such as sulfur, from crude oil called?
a) Desulfurization
b) Distillation
c) Cracking
d) Refining
