want to know about desert?

Desert is a region where, on account of intense cold or insufficient rain, few forms of life and little or no vegetation can exist. Deserts are characterized by intense heat, as in the Sahara or by great cold, as in the Arctic and Antarctic wastes.

Type of Lime stone

Chalk is very white and fine grained type of limestone. It contains fragments of shell, but it also contains white powder which may be organic, chemical or elastic in origin. Chalk is used in making Portland cement, as a fertilizer and as a filler or extender in the manufacture of ceramics, paint, plastics and many other products.