Question

multiple - choice question
anthracite is a type of very pure coal which has the highest concentration of carbon. use the image above to determine what type of rock anthracite is based on the processes each type of rock (igneous, metamorphic and sedimentary) are created.
metamorphic
igneous
sedimentary

Explanation:

Igneous rocks form from magma cooling. Sedimentary rocks form from sediment compaction and cementation. Anthracite forms from lower - grade coal undergoing heat and pressure, which is a metamorphic process.

Answer:

A. metamorphic