Divergent Boundary
When a tectonic plate rips apart, it divides (hence the name divergent) into two pieces. The plates most commonly breaks along parallel faults. As the plates separate along the boundary, the piece between the faults breaks and falls into the asthenosphere. The sea floor, or the ground spreads apart and then magma seeps through the crack and creates volcanoes. Occasionally, earthquakes will take pace on the divergent boundaries.