Oilers/Plant Tenders (HHC) Civil Service Exam 2026 – 400 Free Practice Questions to Pass the Exam

Graphite is a form of carbon, and the correct answer relates to it being associated with anthracite coal. Anthracite coal is a high-grade form of coal that contains a significant amount of carbon, typically over 86%. It is often recognized for its high carbon content and energy density.

Graphite can be produced through the metamorphic processes involving carbon-rich materials such as coal, where the conditions of heat and pressure lead to the formation of graphite. This association highlights the transformation of materials under geological conditions and the relationship between different forms of carbon.

The other choices (Quartz, Granite, and Limestone) represent distinct minerals or rock types that do not relate to graphite. Quartz is primarily composed of silicon dioxide, granite is an igneous rock composed mainly of feldspar and quartz, and limestone primarily consists of calcium carbonate. None of these choices have a direct connection to graphite’s carbon structure or its formation processes.