A) ohio was not admitted to the union until 1870 b) people were migrating from southern to northern states. c) western expansion spread the us population over wider area. d) the world wars resulted in drammatic population shifts in the us. will mark you as brainlinest for correct

How does rain water cause erosion and deposition? a. when acidic water soaks into the ground, water dissolves limestone, resulting in the formation of caves.b. when a river overflows it moves downhill resulting in the formation of caves.c. when it rains, water flows into rivers and streams and moves back to land, resulting in the formation of caves.d. when water empties into lakes, sediment is deposited, resulting in formation of caves.