the.com/chalk
the fossilized corpses of trillions of plankton, now teaching your kids algebra
means A soft, white, porous form of limestone, used as a writing material on blackboards and for marking lines.
from From Old English 'cealc,' which was borrowed early on from Latin 'calx,' meaning 'lime' or 'limestone' — the same root that gives us 'calcium' and 'calculate' (Romans counted with little limestone pebbles). The Latin itself may go back to a Greek word for a small stone or pebble.
- made of
- compressed skeletons of ancient marine microorganisms
- cliffs
- Dover's white cliffs are pure chalk seabed
- gymnast secret
- chalk-dries hands to kill the slip
- not in classrooms
- school chalk is now usually gypsum
- climbing
- every chalk bag holds magnesium carbonate
white cliffs of dover — iconic 350-foot chalk cliffs on the english coast, formed over 70 million years ago
champagne region chalk — subterranean chalk beds in france that give champagne its mineral character and ideal growing conditions
cretaceous period — geological era 145-66 million years ago named from the latin 'creta' meaning chalk, defined by massive chalk deposits