Coal is a rock. It is usually black and can be shiny. The rock is sometimes flaky or dusty, and will often break very easily.
Coal is a sedimentary rock. This means it was deposited on the surface in a layer through a natural process. Layers of coal are called seams; layers of rock, strata.
Coal comes from trees and plants that once formed giant swampy jungles. When the plant life died, it did not rot away, but instead became buried by layers of sand and mud. Slowly over time, the layers of dead plants became buried deeper underground, and were squashed by the layers of sediment above. Over millions of years these layers of dead plants became seams of coal.
To learn more about what coal is, follow the pdf. below and read all of the scientific facts provided by the National Coal Mining Museum for England:
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