Why rust forms on iron ? who answer this question first I will make u brainleist, thanks and I will vote you and I will follow you, you will get 100 points when u answer correct

Hope the above picture might help you :)

pure substance: iron,copper

impure substance: water,charcoal

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.