Why are olivine and quartz never found together in an igneous rock?

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.