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Frequent eruptions along divergent plate boundaries such as the Mid-Atlantic Ridge form new ocean bottom in a process known as seafloor spreading. This process occurs slowly (1-15 centimeters per year) yet relentlessly, moving the platesâand the ocean floor and continents above themâfurther apart.olcanoes are common occurrences along the boundaries of Earthâs tectonic plates. These boundaries allow super-heated molten rock called magma, along with ash and gases, to rise through Earthâs crust and emerge on the surface, often dramatically.
A caldera is caused when the ground around a volcano collapses. The Greek Island of Santorini's harbor is a caldera. A caldera lies below Crater Lake in Oregon. The eruption of a volcano will usually cause magma chambers to collapse.he largest type are known as resurgent calderas. This is caused by the widespread collapse of magma chambers that are not associated with a particular volcano or point of eruption, and they are the largest volcanic structures on Earth.