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Do magnetic stripes on the ocean floor oceanic crust sink back into the mantle?
No, the magnetic stripes on the ocean floor form due to the alignment of magnetic minerals in the crust as it solidifies from the mantle. The oceanic crust is eventually consumed in subduction zones and recycled back into the mantle, but the magnetic stripes themselves do not sink back into the mantle.
Why do deep-ocean trenches form at both types of subduction?
The deepest portions of the subducting plate get pulled under by the subducted plate. This is how the trench is formed. this process is at work when any subduction occurs. An oceanic-continental subduction occurs when ocean crust sinks under continental crust. The oceanic crust sinks because it is colder and denser than the continental crust. At these sites, deep-ocean trenches form, along with coastal mountains.
How does a deep-ocean trench form?
They form when the oceanic crust goes under the Continental crust. The oceanic crust then forms the trenches through a process called subduction.
What structure is formed when ocean crust subducts below continental crust?
A deep ocean trench is formed when ocean crust subducts below continental crust. The descending oceanic plate is forced down into the mantle by the more buoyant continental plate. This process can also lead to the formation of volcanic arcs on the overriding plate.
How are the sections of oceanic crust on either side of the ridge moving?
The sections of oceanic crust on either side of a mid-ocean ridge are moving away from each other due to seafloor spreading. As magma rises from the mantle at the ridge, it solidifies to form new oceanic crust, pushing the older crust outward. This movement is driven by tectonic forces, including mantle convection and the pull of subduction at oceanic trenches. Consequently, the ocean floor is continuously being renewed and expanded.
How do the mantle's convection currents move to form a mid-ocean ridge?
The mantle's convection currents move in the mantle in the form of magma which creates the mid-ocean ridge. Mid-ocean ridges are found in every ocean in the world and when the currents erupt as lava the eventually cool and create a crust.
What happens when the ocean crust sinks deeper inyo the mantle?
When oceanic crust sinks deeper into the mantle at subduction zones, it undergoes partial melting due to the increase in temperature and pressure. This melted material can then rise back to the surface to form volcanoes and contribute to the formation of new crust through volcanic activity. This process is integral to the recycling of Earth's crust and the formation of oceanic trenches and volcanic island arcs.
What happens when continental collides with continental crust?
The oceanic crust is force down into the mantle in a process called subduction. The subducting oceanic plate will introduce water into the hot mantle, causing some of the rock to melt. The molten rock will rise through the overriding continental crust to form volcanoes.
Which is required for an ocean trench to form?
Subduction.
What happens to this crust as it is pushed down into the mantle?
As it is cold and wet, it continues to sink and slowly heats up. This causes partial melting and it acts as a source of magma for volcanoes that form above it. so does other people burn when the go into mantle?
Subduction occurs where the oceanic crust bends down toward the mantle at a(n)?
Seafloor spreading occurs along mid-ocean ridges. Mid-ocean ridges are large mountain ranges on the ocean floor. The shifting in the rock causes the seafloor to spread and allows magma to bubble and form more mountains on the ocean floor.
What happens when oceanic crust and continental crust collide?
Subduction occurs on continental boundaries because oceanic sub floor is denser and heavier than the lighter more buoyant crust. The oceanic crust slides under the continental crust areas usually on a plate boundary. This is in a recycle style mode that constantly is remaking the ocean floor. The oldest rocks on the ocean bottom are a drop in the geologic time bucket, compared to the rock ages on land.
