A convergent plate boundary occurs when a collision of tectonic plates causes one plate to slide over the top of another. There are three examples of convergent plate boundaries that occur as the result of continental and oceanic plate convergence:
Continental vs. Oceanic Convergence When a continental plate and oceanic plate collide, the more buoyant continental plate slides atop the oceanic plate, creating a subduction zone that features deep ocean trenches and volcanic mountains.
Oceanic vs. Continental Convergence When two oceanic plates collide, whichever plate is older (and thus denser) will be covered by the other, newer plate. These collisions result in the creation of volcanic mountains that can surface above the ocean as small island chains.
Continental vs. Continental Convergence When two continental plates collide, neither can "sink", because buoyancy is not a factor. Instead the pieces are crammed together, creating large mountains, such as the Himalayans.Learn More
Very slow currents in the relatively plastic lower mantle, or aesthenosphere, are thought to push the crustal plates along and drive the process of plate tectonics. These currents are caused by convection, with the mantle rock being heated from below via radioactive decay and thus becoming less dense than the rock above. These hotter rocks move slowly upward, displacing the rock above and forcing it down in an elliptical motion.Full Answer >
Earth's tectonic plates move due to the movement of magma in the mantle underneath the crust. Extreme temperatures inside the planet's core cause a convection cycle in which hot magma rises to the surface and eventually sinks back toward the core as it cools.Full Answer >
San Francisco is located on the San Andreas Fault, which is the boundary of the Pacific and North American plates. The friction between these two plates as they slide past one another is the cause of the earthquakes in the San Francisco Bay area.Full Answer >
Tectonic plates and metamorphism are related because the geothermal gradients and metamorphic rocks produced during these phenomena are greatly affected by the movement and heating of the tectonic plates. When Earth?s lithosphere is broken up during the movement of tectonic plates, solid state re-crystallization occurs, and this process is known as metamorphism.Full Answer >