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Mid-ocean ridges mark these sites where the ocean floor is spreading
apart. As the ridges continue to widen, a gap called a
forms. Here molten material rises to build new crust.
When molten material rises from the asthenosphere,
cold ocean water cools the rock until it becomes solid. As the plates
move apart, new cracks open in the solid rock. More molten material
rises and hardens. The growing ridge stands high above the sea floor.
The world's longest ridge, the Mid-Atlantic Ridge, runs the length
of the Atlantic Ocean. Here the North and South American plates are
moving away from the Eurasian and African plates. The ridge extends
nearly 11,000 kilometers (6214 mi) from Iceland to near Antarctica.
The rift valley is 24 kilometers (15 mi) wide and 9 kilometers (6 mi)
deep-about 7 kilometers (4 mi) deeper than the Grand Canyon!
What else can I help you with?
What plate boundaries are where the crust forms?
Mid-ocean ridges are divergent plate boundaries where new oceanic crust forms as tectonic plates move apart. At these boundaries, magma rises from the mantle, cooling and solidifying to create new crust.
In sea-floor spreading what happens to the old oceanic crust as new molten material rises from the mantle?
In sea-floor spreading, the old oceanic crust is pushed away from the mid-ocean ridge as new molten material rises from the mantle. As the new material solidifies, it forms new oceanic crust, leading to the spreading of the seafloor and the continuous creation of new crust. The older oceanic crust eventually gets subducted back into the mantle at tectonic plate boundaries.
When new crust is made what happens to the old crust?
When new crust is made, like at a spreading center, old crust must be destroyed, like at a subduction zone, where it is brought back into the inner earth and melted and recycled through.
How does the movement of the old and the new crust move in seafloor spreading?
In seafloor spreading, the old crust moves away from the mid-ocean ridge as new crust forms through volcanic activity. This movement is driven by the process of mantle convection, where hotter and less dense material rises at the ridge, pushing the tectonic plates apart. As new crust forms at the ridge, it gradually moves away from the ridge as more magma is added, creating a conveyor belt-like system of crustal movement.
Is crust being destroyed or created?
near ocean trenches.
Earth does not get bigger as new oceanic crust forms?
Just as new oceanic crust forms at mid-ocean ridges, old oceanic crust is destroyed at subduction zones.
What plate boundaries are where the crust forms?
Mid-ocean ridges are divergent plate boundaries where new oceanic crust forms as tectonic plates move apart. At these boundaries, magma rises from the mantle, cooling and solidifying to create new crust.
In sea-floor spreading what happens to the old oceanic crust as new molten material rises from the mantle?
In sea-floor spreading, the old oceanic crust is pushed away from the mid-ocean ridge as new molten material rises from the mantle. As the new material solidifies, it forms new oceanic crust, leading to the spreading of the seafloor and the continuous creation of new crust. The older oceanic crust eventually gets subducted back into the mantle at tectonic plate boundaries.
When new crust is made what happens to the old crust?
When new crust is made, like at a spreading center, old crust must be destroyed, like at a subduction zone, where it is brought back into the inner earth and melted and recycled through.
Why doesn't our planet get larger from sea floor spreading?
As new oceanic crust forms at mid-ocean ridges, old oceanic crust is destroyed at subduction zones.
Is the crust new or old in the mid Atlantic ridge?
The crust is new.
What happens to old oceanic crust as new molten material from the mantle?
The older oceanic crust moves away from the spreading center and is eventualy subducted back into the mantle.
What happens to old oceanic crust as new molten material rises to the mantle?
The older oceanic crust moves away from the spreading center and is eventualy subducted back into the mantle.
What happens to the old oceanic crust as new molten material rises from the mantle?
The older oceanic crust moves away from the spreading center and is eventualy subducted back into the mantle.
How does the movement of the old and the new crust move in seafloor spreading?
In seafloor spreading, the old crust moves away from the mid-ocean ridge as new crust forms through volcanic activity. This movement is driven by the process of mantle convection, where hotter and less dense material rises at the ridge, pushing the tectonic plates apart. As new crust forms at the ridge, it gradually moves away from the ridge as more magma is added, creating a conveyor belt-like system of crustal movement.
How does the diagram show that new crust forms from molten materials?
The diagram displays divergent plate boundaries where tectonic plates move apart, allowing molten material from beneath the Earth's crust to rise to the surface. As the molten material cools, it solidifies and forms new crust. This process is known as seafloor spreading.
Why is old oceanic crust denser than new oceanic crust?
cause its cooler
