Smaller Number 3 (12)=36
Larger Number 4 (12)=48
witching circuit theory is the mathematical study of the properties of networks of idealized switches. Such networks may be strictly combinational logic, in which their output state is only a function of the present state of their inputs; or may also contain sequential elements, where the present state depends on the present state and past states; in that sense, sequential circuits are said to include "memory" of past states.
Acid rain has sulphate ions that have acidic properties of corroding a rock and hence cause weathering
Since acid rain is formed by sulphuric acid dissolved in water i.e. sulphate ions it's pH is low meaning it's acidic in nature hence it has the property of corroding a metal or rocks in general.
If rocks are corroded by acid rain (sulphate ions) they will turn weather.