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Explain the relationship between trenches and seafloor spreading?
1. New sea-floor is created by the upwelling of magma at mid-ocean spreading centers; old ocean floor is destroyed by subduction at deep sea trenches. 2. The area is a subduction zone. Magma from underground comes up and destroys that crust. That crust is then recycled and the magma cools and hardens. That creates new land, that creates the trenches. Seafloor spreading is in the ocean and happens with convection currents. That is the relationship between. 3. As new seafloor is formed at mid-ocean ridges, the old seafloor is pushed down into trenches at subduction zones.
What replaces magma in the Earth?
The subduction and melting of oceanic crust replaces magma in the earth.
Why is there no volcanoes at conservative margins?
As there is no subduction, the magma is not disturbed and the two plates simply slide past each other, crust is neither created, nor destroyed
What happens when oceanic and continental crust meets?
Subduction. denser oceanic plate moves under the continental plate. The oceanic plate is submerged into the mantle causing magma to rise to the surface.
How does magma become a igneous rock?
Igneous rock, if heated sufficiently by subduction processes will melt to form magma.
What happens along a plate boundary that leads to high occurrences of volcanoes?
Subduction happens along plate boundaries which pushes up magma which then creates volcanoes.
Explain the relationship between trenches and seafloor spreading?
1. New sea-floor is created by the upwelling of magma at mid-ocean spreading centers; old ocean floor is destroyed by subduction at deep sea trenches. 2. The area is a subduction zone. Magma from underground comes up and destroys that crust. That crust is then recycled and the magma cools and hardens. That creates new land, that creates the trenches. Seafloor spreading is in the ocean and happens with convection currents. That is the relationship between. 3. As new seafloor is formed at mid-ocean ridges, the old seafloor is pushed down into trenches at subduction zones.
What happens after magma erupts along mid ocean?
The magma spills over the ridge and pushes the old sea floor away toward a subduction zone where the old sea floor melts.
What replaces magma in the Earth?
The subduction and melting of oceanic crust replaces magma in the earth.
Where is andesitic magma found?
Andesite can be found around volcanoes with magma of intermediate composition, usually near subduction zones.
Why is there no volcanoes at conservative margins?
As there is no subduction, the magma is not disturbed and the two plates simply slide past each other, crust is neither created, nor destroyed
What happens when oceanic and oceanic crust meets?
Subduction. denser oceanic plate moves under the continental plate. The oceanic plate is submerged into the mantle causing magma to rise to the surface.
What happens when oceanic and continental crust meets?
Subduction. denser oceanic plate moves under the continental plate. The oceanic plate is submerged into the mantle causing magma to rise to the surface.
What happens to magma after it erupts onto the ocean floor?
The magma spills over the ridge and pushes the old sea floor away toward a subduction zone where the old sea floor melts.
Why do volcanoes form above subduction zones?
magma forms in mantle above slab
How was Mt St Helens created?
Mount St. Helens was created due to the subduction of the Juan de Fuca plate below the North American plate. This subduction caused partial melting of material in the mantle which formed magma. This magma was more buoyant than the surrounding material so migrated towards Earth's surface, resulting in the formation of volcanoes in the Cascades mountain range, including Mt. St. Helens.
What happens after magma cools?
It turns into rock. Islands can be created by the newly formed rock.
