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Plate Boundaries: Mid Ocean Ridges
Transcript of Plate Boundaries: Mid Ocean Ridges
It is about 60 000 kilometers in length.
Consists of thousands of individual volcanoes.
It is made when two Oceanic Plates collide. How Does it Work The Mid-Ocean Ridge was made when two oceanic plates collided.
It is a recycling center for the Earth: old crust is drawn back into the mantle, while new ocean floor is created, renewing the surface of our planet.
Ridge Push is an important role in the Mid-Ocean Ridge's recycling process.
Ridge Push is when two oceanic plates collide allowing magma to escape from the Lithosphere creating more Oceanic Crust.
Without ridge push much of the oceanic plate would be drawn into the magma and be melted through slab pull
Slab Pull is when one Oceanic Crust goes under another and melts in the magma. Landforms Rift Zone: The center of the highest part of the Mid Ocean Ridge.
Rift valley: A valley at the top of the Mid Ocean Ridge.
Oceanic Plates Where do we Find it on Earth? It is found throughout many of the Earth's water ways. Earthquakes Involved in Mid-Ocean Ridges The lava gradually cools, contracts, and cracks, creating faults. Most of these faults are normal faults.
Along the faults, clocks of rock break and slide down away from the ridge, producing earthquakes.
Near the spreading ridges, the plates are thin and weak. The rock hasn’t cooled completely so it is still somewhat flexible, thus large strains can’t build, and most earthquakes near spreading ridges are shallow.
Shallow focus earthquakes occur at the mid ocean ridges because the thin lithosphere found there is too weak to allow a large amount of strain to build up and cause larger earthquakes. Volcanoes Involved in Mid-Ocean Ridges The mid ocean ridge system is the largest single volcanic feature on the Earth.
It consists of thousands of individual volcanoes which erupt periodically.
Beneath a typical mid-ocean ridge, mantle material partially melts as it rises. This melted rock collects in a reservoir, awaiting eruption. Eventually, most of the magma will freeze in place, forming new oceanic crust without erupting at all.
The average oceanic crust is around 10km thick, but only the upper 1 to 3 km are formed by eruption.
Thin layers of new crust are added with each eruption.
Because the ridge is the main site of volcanic activity, seawater circulates continually, in order to cool the new crust.
This process of magma ascending and lava erupting is on-going. Bibliography http://www.whoi.edu/main/topic/mid-ocean-ridges