Usually, one of the converging plates will move beneath the other, a process known as subduction. If two tectonic plates collide, they form a convergent plate boundary. When two tectonic plates meet, we get a “plate boundary.” There are three major types of plate boundaries, each associated with the formation of a variety of geologic features. Heat within the asthenosphere creates convection currents that cause tectonic plates to move several centimeters per year relative to each other. The Earth’s outer crust (the lithosphere) is composed of a series of tectonic plates that move on a hot flowing mantle layer called the asthenosphere. The team conducted multiple dives at Brimstone Pit during the expedition, finding that each one was more incredible than the last, until finally they saw glowing red lava jetting out of the vent on their final dive! Video courtesy of Submarine Ring of Fire 2006 Expedition, NOAA/PMEL. The eruption took place at the Brimstone Pit vent site on the Pacific's NW Rota-1 volcano. This video, collected during the Submarine Ring of Fire 2006 expedition, marked the first ever observation of an underwater volcanic eruption. Volcanoes are one kind of feature that forms along convergent plate boundaries, where two tectonic plates collide and one moves beneath the other. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video
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