Assam HS Economic Geography Practice Questions - Assam State School Education Board (ASSEB AHSEC) Higher Secondary Class 11-12 Economic Geography Examination Exam

Gondwana coal is younger and high in moisture, while Tertiary coal is ancient carbonaceous anthracite. Gondwana coal is over 200 million years old and low in sulfur, whereas Tertiary coal is younger (55 million years) with higher moisture and sulfur content. Gondwana coal is exclusively found in coastal lagoons, whereas Tertiary coal forms inland mountain plateaus. Gondwana coal is metamorphic, whereas Tertiary coal is purely igneous.