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Because chalk shows up more you stupid jebend
well chalk is a white lime stone and limestone is sedimentry
You can write with a soft stone on a harder stone; writing with chalk on slate is a familiar example.You can also write with a hard stone on a softer stone, using the harder stone as an engraving tool. There are a lot of examples of this on paleolithic artifacts.
A common Cretaceous stone found in some parts of the world is a limestone we know as chalk.
A skipping rope. Chalk and a stone (hopscotch)
Chalk
Chalk
as of stone
chalk is produced by the shells of sea creatures lying on the sea bed and then the pressure of the water pushing the shells together until they form stone
chalk
Bezoar(Stone)
discomfort in the stomach zone