Occurs when hydrofluoric acid an aqueous solution of hf reacts with the silicon dioxide in the glass to form gaseous silicon tetrafluoride and liquid water.

The correct answer is etching.

Explanation:

Etching is defined as the process in which a strong acid is used to cut in the parts of unprotected parts of a metal surface to create a design.

When buffered hydrofluoric acid is treated with glass containing silicon dioxide , it leads to the formation of silicon tetrafluoride and water.

When silicon tetrafluoride is further treated with hydrofluoric acid, it leads to the formation of hydrofluorosilicic acid.

The chemical equations for the above process is:

Thus, the correct answer is etching.

the answer would be a

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.