Which object goes where am I right if not what’s the correct answer

What weather system might be occurring if the pressure gradient decreases and fish harvests in peru are weaker than normal

Where does the availability of water pose the greatest problem

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.