No. Blackboard chalk is calcium sulfate, also known as gypsum.
Cliff chalk is calcium carbonate, also known as calcite or limestone.
Well you see, as the chalk rubs against the blackboard bits of it get left behind, showing you what your teacher thinks your cursive should look like, or a new trick when dividing big numbers.
Chalk.
the white cliff of dover is chalk
You can get it off of a chalk Cliff or in limemud. after you bang your mom
Chalk.
Chalk.
Beachy Head
They're made of limestone (chalk).
Panorama of Beach and Cliff House - 1903 was released on: USA: September 1903
In the UK, Beachy Head, is the highest chalk sea cliff in Britain, at 162 metres (531 ft) above sea level.
Santa Cruz Beach and Cliff Drive - 1911 was released on: USA: 24 August 1911
The 'white Cliffs of Dover" are made of chalk and a little crumbly.