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)
Because if a factual essay then including you opinion is not a fact but a way you can include it is if you writeing a opinion essay or you are giving your experience related to the topic