Chalk and Coal Definition

Definition of Chalk and Coal

The general Chalk and Coal definition can be stated as: Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers. 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 Chalk and Coal, get to know about Properties of Chalk and Coal. Get to know more information about Chalk and Coal origin and discoverer, etymology and class.

History of Chalk and Coal

The history of Chalk 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.

Chalk and Coal Origin and Discoverer

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

Etymology of Chalk and Coal

Along with Chalk and Coal definition, know more about the etymology of Chalk and Coal. Etymology of Chalk and Coal gives information about origin and formation of a particular rock. Know more about Formation of Chalk and Formation of Coal. The etymology of Chalk is From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone while that of Coal is From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Chalk and Coal belong to Sedimentary Rocks. The sub-class, group and other categories of Chalk and Coal are listed below.

For Chalk,

• Sub-class: Durable Rock and Soft Rock
• Group: Not applicable
• 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