Porcupines can NOT throw their quills. Porcupine vision is poor, but they have an excellent sense of smell. Porcupines make shrill screeches, whines, and low grunts. Porcupines are vegetarians, and they eat a large variety of plants, shrubs and trees. Baby porcupines are called porcupettes..
Freebase (0.00 / 0 votes) Rate this definition: Divergence. In vector calculus, divergence is a vector operator that measures the magnitude of a vector field's source or sink at a given point, in terms of a signed scalar. More technically, the divergence represents the volume density of the outward flux of a vector field from an infinitesimal volume around a given point. For example, consider air as it is heated or cooled. The relevant vector field for this example is the velocity of the moving air at a point.
Divergent boundaries are one of the bi-products of plate tectonics. As the name implies, divergent boundaries are formed when two adjacent tectonic plates separate, i.e., when they diverge. When tectonic plates start to diverge, the linear feature formed is called a rift. Sometimes, the gap widens and sometimes it stops. When the gap eventually widens, it then evolves into a rift valley. Divergent boundaries that occur between oceanic plates produce mid-oceanic ridges.