boule. 1  first-person singular present indicative of bouler. 2  third-person singular present indicative of bouler. 3  first-person singular present subjunctive of bouler. 4  first-person singular present subjunctive of bouler. 5  second-person singular imperative of bouler.
There are three main types of plate boundary: divergent, convergent and transform. Plates move away from one another at divergent boundaries. This happens at mid-ocean ridges. Plates move towards one another at convergent boundaries; one plate is forced below another in a process called subduction. Earthquakes and composite volcanoes are common at this type of boundary. Plates move past on another at transform boundaries. The most famous example of this type of boundary is the San Andreas Fault in California. Image: Cutaway artwork showing different types of plate boundary and hotspots. From left: a divergent boundary, a hotspot, a convergent boundary, and another hotspot (credit: Gary Hincks/SPL).
In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other.