COAL

Wed, 8 Jan '25

Shade of black

Sun, 22 Dec '24

Rhyme for "soul" in "Frosty the Snowman"

Wed, 20 Nov '24

Declining industry of Appalachia

Fri, 30 Aug '24

Traditional Scottish New Year's gift, representing warmth for the year to come

Mon, 22 Apr '24

*Nonrenewable energy source … and the start of an eight-step word ladder

Tue, 25 Apr '23

Combustible rock

Mon, 18 Jul '22

What Santa gives naughty children

Wed, 6 Oct '21

One source of global warming