question: tides:moon gravity:sun gravity
choices.label: A B C D
choices.text: earthquake:tsunami:volcanic eruption car accident:illegal driving:drunk driving pollution:human activity:tail emission mudslides:torrential rain:deforestation
explanation: "tide" occurs because of the combined action of "moon gravity" and "sun gravity" a "tsunami" is a destructive ocean wave produced by an undersea "earthquake", volcanic eruption, undersea landslide or meteorological changes. "earthquakes" and "volcanic eruptions" may trigger "tsunamis". the cause of a "car accident" can be a "car accident" or "illegal driving", and the combined effect of "car accident" and "illegal driving" is not required the cause of "pollution" can be either "pollution" or "human activities", and there is no need for the combined effect of "pollution" and "human activities" "mudslide" occurred because of the combined effect of "torrential rain" and "deforestation".
relation: tides moon gravity sun gravity R5.1
relation: earthquake tsunami volcanic eruption R5.1
relation: mudslides torrential rain deforestation R5.1