What Is the Geologic Difference Between "Soft Coals" and "Hard

question 29

Essay

What is the geologic difference between "soft coals" and "hard coals" in terms of their composition, occurrence and use.

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Definitions:

False Ribs

The lower ribs (usually ribs 8 through 12) that are not directly attached to the sternum but are connected to the true ribs above them by cartilage.

Costal Cartilage

Bars of hyaline cartilage that extend the ribs anteriorly and contribute to the elasticity of the chest wall.

Sternum

A flat bone located in the center of the chest, connected to the ribs via cartilage, forming a major part of the rib cage and protecting vital organs in the thorax.

Mandibular Fossa

A depression in the temporal bone that forms the socket for the condylar process of the mandible, contributing to the temporomandibular joint.