Why does acids that has been accidentally spilled on a book cause the colour of the book cover and the ink to change?

One does not belong why? ice, gold ,wood ,diamond and table salt

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

Which statement are accurate about snow flakes