炭 carbon

山 (mountain) + (cliff) + 火 (fire)
★☆☆☆☆
9 strokes
BETA
I was going to skip this one altogether, but with global warming and shit,everyone gotta know about carbon dioxide. Or not.

Onyomi

TAN

That's not a sunTAN, that's brown skin from carbon dioxide pollution.

Mnemonic

A fire burning on a volcanic mountain sends carbon dioxide down the cliff.

Jukugo

石炭(せきたん)

coal ☆☆☆☆☆
石 (rock) + 炭 (carbon) = 石炭 (coal)

二酸化 炭素(に さんか たんそ)

carbon dioxide ☆☆☆☆☆
二 (two) + 酸 (sour) + 化 (transform) + 炭 (carbon) + 素 (element) = 二酸化 炭素 (carbon dioxide)