Explain how the atmosphere interacts with two other of earth's spheres (explain in essay)

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Compounds a and b react to form compounds c and d according to the equation: aa + bb → cc + dd. under which conditions will the rate law be given by the equation: rate = k[a]a[b]b? a. the reaction takes place in one step. b. the reaction is endothermic. c. the reaction is exothermic. d. the reaction involves more than one step.

Which part of the mantle is similar to the crust ? (science)