describe the relationship between the age of the rocks and their distance from the mid ocean ridge, please look at the picture to describe their relationship, thank you!

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

Answer explain why it is not possible to deduce a complete order of reactivity.