Scoria and Coal Definition

Definition of Scoria and Coal

The general Scoria and Coal definition can be stated as: Scoria is a dark-colored extrusive igneous rock with abundant round bubble-like cavities. On the other hand, Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers called coal beds. Along with definition of Scoria and Coal, get to know about Properties of Scoria and Coal. Get to know more information about Scoria and Coal origin and discoverer, etymology and class.

History of Scoria and Coal

The history of Scoria and Coal gives information about where the rock was found and who was its discoverer. Almost each and every aspect of Earth's history is recorded in rocks be it the volcanoes which were erupted or the plants, animals and organisms which are now extinct, as rocks are present from millions of years.

Scoria and Coal Origin and Discoverer

Scoria and Coal definition gives us a brief idea about the two rocks. In some cases, the definition also gives summary about the Formation of Scoria and Coal. In this section, you will know about Scoria and Coal Origin and Discoverer. Origin of Scoria is Unknown whereas Origin of Coal is USA. It is interesting to know the name of Scoria and Coal discoverer. The Discoverer of Scoria is Unknown and the discoverer of Coal is John Peter Salley.

Etymology of Scoria and Coal

Along with Scoria and Coal definition, know more about the etymology of Scoria and Coal. Etymology of Scoria and Coal gives information about origin and formation of a particular rock. Know more about Formation of Scoria and Formation of Coal. The etymology of Scoria is From late Middle English (denoting slag from molten metal), from Greek skōria refuse, from skōr dung while that of Coal is From late Middle English (denoting slag from molten metal), from Greek skōria refuse, from skōr dung. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Scoria belongs to Igneous Rocks while Coal belongs to Sedimentary Rocks. The sub-class, group and other categories of Scoria and Coal are listed below.

For Scoria,

• Sub-class: Durable Rock and Medium Hardness Rock
• Group: Volcanic
• Other Categories: Fine grained rock and Opaque rock

For Coal,

• Sub-class: Durable Rock and Soft Rock
• Group: Not applicable
• Other Categories: Coarse grained rock, Fine grained rock, Medium grained rock and Opaque rock