Multiple choice

Which list represents the correct order of coal development?

  1. peat, lignite, bituminous, anthracite

  2. peat, lignite, anthracite, bituminous

  3. anthracite, bituminous, lignite, peat

  4. bituminous, peat, lignite, anthracite

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A Correct answer
Explanation

Coal formation progresses through stages of increasing heat, pressure, and carbon content: peat, lignite, bituminous, and finally anthracite.