You are presented with the quiz "How are alluvial aquifers created?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "wind and rain cause erosion" and "alluvial aquifers are the result of erosion". So, what's the best answer to the question?

OPT:
1). By sand and snow;
2). By wind and rain;
3). By sunlight and soil;
4). By animal activity;
5). a hydraulic system;
6). Sediment;
7). storing water;
8). Physical weathering;
Answer:
2).