Which statement about coal formation is true?

Which statement about coal formation is true?

• A. Higher heat and pressure over time lead to denser coal types
• B. Coal forms from minerals in rock
• C. Coal is formed by crystallization of methane
• D. Coal is a renewable resource

Answer: (A)

Coal formation comes from ancient plant material that gets buried and altered by heat and pressure over long periods. As sediments cover the material, temperatures rise and chemical reactions drive coalification, removing water and gases and increasing carbon content. This continuous transformation makes the material denser and more energy-rich, producing progressively denser coal types—peaking with anthracite as conditions become hottest and most geologically advanced. That’s why the statement about higher heat and pressure over time leading to denser coal types is true. The other options don’t fit: coal forms from plant material, not minerals in rock; it isn’t produced by crystallizing methane; and coal is not renewable because it forms over millions of years.

Coal formation comes from ancient plant material that gets buried and altered by heat and pressure over long periods. As sediments cover the material, temperatures rise and chemical reactions drive coalification, removing water and gases and increasing carbon content. This continuous transformation makes the material denser and more energy-rich, producing progressively denser coal types—peaking with anthracite as conditions become hottest and most geologically advanced. That’s why the statement about higher heat and pressure over time leading to denser coal types is true. The other options don’t fit: coal forms from plant material, not minerals in rock; it isn’t produced by crystallizing methane; and coal is not renewable because it forms over millions of years.