Correct Answer: Its carbon and moisture content
Subject: geography
Explanation: • The heat value of coal depends directly on its carbon and moisture content. • High carbon and low moisture (like Anthracite/Bituminous) mean high heating value. • Low carbon and high moisture (like Peat/Lignite) give lower calorific value. • While depth and rock system matter for age, the exact market value is tied to chemical composition (Carbon %). • Trick: 'More Carbon = More Heat = More Money'. • Coal also contains apart from carbon: hydrogen, sulphur, oxygen, and nitrogen.
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