Where the Pacific plate collides with the Indo-Australian plate, it is forced downwards into the trench, a subduction zone, and the volcanoes are carried with it.
Prof Sanders agrees that fruit and vegetables are not "super foods" that protect against cancer but - like many nutritionists - takes the view that it is better to fill up your plate with vegetables than a lot of the other high-calorie food it's so easy to snack on.
As a consequence, it's almost impossible to over-exaggerate how remarkable it is that Sunday's big football match between River Plate and Boca Juniors - the two major football clubs in the country - has been moved to allow the nation to watch Pichot and his team in Paris.