The sandstone is older.in order for the granite to have been formed with sandstone in its precnese then it had to have already exsisted in that area..making it older.
Empirical formula is a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
so, in this case :
ratio of x to y is 6:3 or 2:1 . Empirical formula would be
They make finding things easier so we plug abs don’t need to go on the other planets and can just send the -robots
The answer to your question would be D) chemical bonding because when you are bonding atoms to each other you are creating a new and unique substance