I really find the sensation of chalk on my skin unpleasant. Do you have any odd sensory quirks?
I know what you mean but it probably because of it porous, sedimentary texture
Yes, I dislike pumice as well, you're probably right. It's a shame, though, because I enjoy making art with my kids and sidewalk chalk is so easy to clean up. Do you ever draw with chalk?
No but I understand that it is composed of a calcite ionic salt called calcium carbonate
Yes, usually mixed with water-soluble pigments. Are you interested in chemistry or geology? you seem to have a very scientific bent to your conversation. 
yes I am . I like science a lot but another fact is chalk as seen cretacious depoit is unusual amomg sedimentary limestones in the thicknes of the beds
Hm, that's true. Have you ever seen the chalk cliffs of Dover? It's a really striking example of a large natural chalk deposit.
the clays with which it is usually associated, thus forming tall, steep cliffs where chalk ridges meet the sea. Chalk hills, known as chalk downland, usually form where bands of chalk reach the surface at an angle, so forming a scarp slope. Because chalk is well jointed it can hold a large volume of ground water, providing a natural reservoir that releases water slowly through dry seasons.
Mining.
Chalk is mined from chalk deposits both above ground and underground. Chalk mining boomed during the Industrial Revolution,
in 12 days. Fernando di Leo was not happy with the results of the film, stating that it was a "disappointing film indeed, including my toying with Lorraine De Selle's nude scenes. It's mediocre, but not because I did wrong - I just wasn't interested in it." The director stated he was a hired hand on the film, which lead him to feel that "you don't always have the chance to do what you want, and often you know very well you're making a