A divergent boundary is a type of tectonic plate boundary where two plates move away from each other. Synonyms for divergent boundary include spreading boundary, constructive boundary, and tensional boundary. At these boundaries, new crust is created as magma rises to fill the gap between the plates. The opposite of a divergent boundary is a convergent boundary where two plates move towards each other, resulting in the destruction or fusion of crust. Understanding the different types of plate boundaries is crucial for geologists and seismologists in predicting and understanding earthquakes, volcanic eruptions, and other geological phenomena.