Math 1b harvard
2 plates with two dislocations each. (a) Plate with two dislocations that create hexagonal, six-sided spirals away from the core, traced out in the light and dark blue lines. This plate is also shown in Figure 1b in the main text. (b) Plate that contains two dislocations that create different spiral shapes. The Jun 09, 2020 · A divergent plate boundary often forms a mountain chain known as a ridge. This feature forms as magma escapes into the space between the spreading tectonic plates. One example of a ridge is the Mid-Atlantic Ridge, an undersea chain of mountains that formed as two pairs of tectonic plates spread apart: the North American Plate and the Eurasian Plate in the north, and the South American Plate and the African Plate in the south. Because ocean ridges are found underwater, often at great depths ... Convergent boundaries(or active margins) occur where two plates slide towards each other commonly forming either a subduction zone (if one plate moves underneath the other) or a continental collision (if the two plates contain continental crust). Deep marine trenches are typically associated with subduction zones.