This is the creation of brand new crust! This crust can remain deep under the oceans, creating underwater ridges, or it can rise to the surface over time to form islands.When two continental plates separate, it is theoretically possible for a similar thing to happen volcanoes could form to create new crust. When these plates separate, the magma rushes up to fill the gap and creates underwater volcanoes. Continental plates are indeed above sea level, but again, what makes a plate officially continental is the presence of felsic or granitic rock.Most divergent boundaries in the world today are between two oceanic plates. Oceanic plates are composed of mafic or basaltic rock. Instead, it’s more about the plate’s composition. But the ‘oceans’ part isn’t actually what makes it an oceanic plate because there are some exceptions to this rule. ![]() Oceanic plates are, unsurprisingly, plates below sea level and under the oceans. * All Partners were chosen among 50+ writing services by our Customer Satisfaction Team Features of Divergent BoundariesĮxactly what happens when two plates diverge depends on the two types of plates involved: oceanic plates and continental plates. This creates a series of volcanoes all the way along the boundary. When this happens, they leave a gap in-between, and this gap can be filled by the magma from below. This magma is solid but becomes a liquid when it reaches the surface through volcanoes.A divergent boundary, or constructive boundary, is where two sections of the eggshell – two tectonic plates – are moving away from each other. These plates float on a sea of hot magma. While it might seem solid enough, it is actually broken into sections called tectonic plates. While nobody has ever dropped the Earth (as far as we know!), the cracked surface of the egg is just like the Earth’s crust. You pick it up to find the whole surface littered with lines and breaks. Suddenly it slips from your hand and hits the floor with a crack. You’ve just boiled an egg and are removing the shell. A number of features and examples of divergent boundaries will be introduced. In this lesson, you will learn the meaning of the term ‘divergent boundary’ in the context of plate tectonics.
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