Glacial striations have been found in South America, South Africa, India, and Australia. what do these marks tell scientist

Silica, sio2, is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when silicon is exposed to o2 gas at an elevated temperature. at 900˚c, it takes 90 minutes for the oxygen to diffuse from the surface to form a 0.06 micron (0.06 x 10-6 m) thick layer of sio2 on

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added

Which is an example of a reversible physical change?