Explain the features at a constructive boundary and why they form?

Answer 1

Constructive plate boundaries are those which are most commonly found between two oceanic plates. These locations include the South American Plate and the African plate, Indo-Australian Plate and Antarctic Plate and between the Nazca and Pacific Plate. the worlds longest constructive boundary is the Mid-Atlantic Ridge. These boundaries can be defined as boundaries which create new crustal material. The plates involved in this kind of boundary are diverging, or moving apart, which is the reason the boundaries are sometimes called 'divergent boundaries'. These plates cause some small-scale localised earthquakes. They also cause underwater volcanoes, where the magma rises from the mantle and cools quickly to form solidified igneous rock. Over time this rock builds up to create a chain of volcanoes, some of which become so large that they become volcanic islands such as ones found around Iceland. also associated with this type of boundary are smaller, transform boundaries running at right angles from the main fault.