Chalk

A soft rock (calcium carbonate) often white or light in colour, formed from shell fragments of minute sea organisms.
Definition source: Chambers 21st Century Dictionary

Català
guix
Česky
křída
српски / srpski
kреда, kreda
Deutsch
Kreide
Ελληνικά
κιμωλία
Español
yeso
Français
craie
Italiano
gesso
Latviešu
krīts
Nederlands
krijt, kalk
Norsk
kalk
Polski
kreda
Português
giz
Română
cretă
Русский
мел