Distribution of Volcanoes : Why most volcanoes in the world (95%) are located al
ID: 803994 • Letter: D
Question
Distribution of Volcanoes: Why most volcanoes in the world (95%) are located along mid-oceanic ridges or found in chains parallel to trenches?
Ocean floor age: Why the ocean floor is progressively older as you move away from the oceanic ridge? Why there is no ocean floor on Earth older than ~ 200 million years?
Distribution of earthquakes: Why earthquakes occur only in narrow zones of the Earth (i.e. mid-oceanic ridges and trenches)?
Distribution of Mountain Ranges: Why large mountain ranges are also located in such zones? What caused these mountains to form?
Explanation / Answer
1) most volcanoes are situated at plate boundaries because these are the places where magma can easily rise on to the suface.
2) new oceanic crust is formed along the axis of mid oceanic ridge, this formation of newer crust will displace the older crust away from the ridge axis . so the crust far from the MOR is older.