What does erosion do? a. breaks rocks apart b. cements sediments c. moves bits of rock and soil d. forms rocks

I think the answer is A. breaks rocks apart. 

This is going to be A: "breaks rocks apart". B and D don't have to do with erosion, and while erosion can move rock and soil, it's biggest effect is breaking apart the ground.

Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2

(no3)⁻n has oxidation number x,o has oxidation number -2.(x*1 -2*3) charge of the nitrate ion, and we know that charge of the nitrate ion =-1.so,(x*1 -2*3) =-1x-6=-1x=+5answer a. +5.