Can anybody help with b, c, number 7 or number 8? any question is fine i’ve just been stuck on this chem packet for a few hours oop

Which of the following mining methods disrupts the sea floor?

Which feature do highland climates have that lower elevation areas do not?

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.