7. you are to select the best facing stone (i. e. resistant to weathering and an attractive mixture of large crystals of light and dark minerals) from the following. which one would you choose? basalt shale limestone granite

Granite

Explanation:

The best facing stone , is the Granite .

Since ,

Granite is resistant to the process of weathering on the account of the presence of the quartz , which is made up of silicon dioxide , i.e. , SiO₂ ,

Since the bond between the silicon atom and the oxygen atom is very strong ,

therefore , it is very difficult to break the bond between silicon  and oxygen .