The Earth’s lithosphere, which includes the crust and upper mantle, is made up of a series of pieces, or tectonic plates, that move slowly over time.
The (developing) boundary between two spreading continental plates is known as a continental rift.
Look it up now! Download image (jpg, 76 KB). Destructive plate boundary. Unlike convergent boundaries, divergence occurs between only oceanic or only continental plates, not one of each.The vast majority of divergent boundaries are found in the ocean, where they were not mapped or understood until the mid-to-late 20th century. There are a number of different types of plate boundary. Plate boundaries. Divergent plate boundaries: spreading-center volcanism Spreading-center volcanism occurs at rift-zones, where two plates are moving apart from each other. Most commonly this is the case at mid-oceanic ridges, where two oceanic plates move apart. This image shows the three main types of plate boundaries: divergent, convergent, and transform. Divergent boundaries exist where tectonic plates move apart from each other. Image courtesy of the U.S. Geological Survey. A destructive plate boundary is sometimes called a convergent or tensional plate margin. Divergent plate boundary definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation.