Answer: You summarize, heres some advice also make sure to get the main idea of the topic in the concluding paragraph.
The answer is in, choice 1. It is the only preposition that makes sense in that sentence
A landslide is any geologic process in which gravity causes rock, soil, artificial fill or a combination of the three to move down a slope. Several things can trigger landslides, including the slow weathering of rocks as well as soil erosion, earthquakes and volcanic activity. (I gooogled this sorry if it doesn’t help, it might help you cancel out some answers tho)
