Divergent boundaries or borders the sliding plates
This is the border between the plates, moving in opposite directions. In the relief of the Earth, these boundaries are expressed rifts, they dominated tensile strain, the reduced thickness of the crust, heat flow is maximum, and is active volcanism. If such a boundary is formed on the continent, the continental rift is formed, which later can turn into an oceanic basin with an oceanic rift in the center. In the oceanic rifts as a result of spreading, a new oceanic crust.
Oceanic rifts
On the oceanic crust rifts are confined to the central parts of the mid-ocean ridges. They are the formation of new oceanic crust. Their total length of more than 60 thousand kilometers. They timed the set of hydrothermal vents, which make the ocean a significant part of deep heat, and dissolved elements. High-temperature sources are called black smokers, associated with them significant reserves of non-ferrous metals.
Continental rifts
The division of the continent on a part begins with the formation of the rift. Cora refines and unfolds, begins magmatism. An extended linear cavity depth of the order of hundreds of meters, which is limited by a series of discharges. There may be two options: either expanding rift terminated and he is filled with sedimentary rocks, becoming aulacogene or continents continue to move apart and between them had been in a typical oceanic rift begins to form oceanic crust.