Page 79 - Carvaan Science-2

Chalk : It is a soft white rock. It is used for writing
on the blackboard.

Chalk

Slate : It is a soft black rock. It is used for making
blackboards and roofs of houses.

Minerals

Rocks are made of substances called minerals . Some Slate

rocks have only one type of mineral. Some rocks may have two or more
types of minerals.

Talc : It is used for making talcum powder.

Diamond : It is the hardest mineral. It is very precious and used in
jewellery. It is also used to cut glass.

Gold and Silver are minerals used to make jewellery.

Silica is used to make glass.

Quartz is used in watches.

Iron is used to Tungsten is used
make nail. in electric bulb.

Silica is used Talc is used to make
to make mirror. talcum powder.

Graphite is used as
lead of pencil.

79 Science-2