Question

Slate pencils disadvantages

Answer 1

Explanation:

Slate pencils contains calcium carbonate and it may be harmful when it is taken in excessive amount,then it may cause stone formation in kidneys. The continuous craving for eating inedible substances (like chalk, slate pencils etc) is known as Pica. It is one of the features of Iron deficiency anemia

Answer 2

Answer:

Slate pencils contain calcium carbonate and some people inhale them as they are having deficiency of calcium in their body .But is very harmful to the body as it forms stones in body called cyst .Which is divided into small pieces by laser if it is minor and if it is very hard then by surgery .

For your info:

1. cyst is also called by seeds if tomato.
2. It is also caused by eating chalks,soil ,stones ,slate pencils etc....