Options are:
[1]. stone filtering;
[2]. rock formations;
[3]. water stagnating;
[4]. rock growing;
[5]. alluvial;
[6]. flooding;
[7]. coastlines;
[8]. permineralization;

You are presented with the quiz "Rain causes what and sculpts landscapes?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "rain causes erosion" and "erosion sculpts the landscape, creating fantastic rock formations". So, what's the best answer to the question?
Answer:
[2].