When the material P mined from the earth is processed, a black solid Q is produced which consists mainly of carbon. When another material R obtained from trees is heated in an insufficient supply of air, it produces another solid fuel S which also consists mainly of carbon. Name P, Q, R and S.

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$P$ : Coal (mined from the Earth)
$Q$ : Coke (solid, consists mainly of carbon, produced during coal processing)
$R$ : Wood (obtained from trees)
$S$ : Charcoal (consists mainly of carbon)

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When the material P mined from the earth is processed, a black solid Q is produced which consists mainly of carbon. When another material R obtained from trees is heated in an insufficient supply of air, it produces another solid fuel S which also consists mainly of carbon. Name P, Q, R and S.

P: Coal (mined from the Earth)Q: Coke (solid, consists mainly of carbon, produced during coal processing)R: Wood (obtained from trees)S: Charcoal (consists mainly of carbon)

$P$ : Coal (mined from the Earth)
$Q$ : Coke (solid, consists mainly of carbon, produced during coal processing)
$R$ : Wood (obtained from trees)
$S$ : Charcoal (consists mainly of carbon)