Multiple choice Which list represents the correct order of coal development? peat, lignite, bituminous, anthracite peat, lignite, anthracite, bituminous anthracite, bituminous, lignite, peat bituminous, peat, lignite, anthracite Reveal answer Fill a bubble to check yourself A Correct answer Explanation Coal formation progresses through stages of increasing heat, pressure, and carbon content: peat, lignite, bituminous, and finally anthracite.