Oceanic crust isn't destroyed because it's old; it is, in fact, destroyed due to destructive plate boundaries. This is where a continental plate and an oceanic plate move towards each other. As the oceanic crust is denser, it is pushed under the continental plate. Here it is forced into the mantle of the earth, where it is destroyed due to heat and convection currents.
Old oceanic crust is destroyed at subduction zones. At these locations, a plate with old, dense oceanic crust collides with either continental crust or younger, less dense oceanic crust. The denser oceanic crust is forced downward by the lighter crust and into the mantle, where it is gradually assimilated.
Oceanic crust is destroyed under a continent.
Oceanic Crust is destroyed under a continent.
near ocean trenches.
The sea floor is pushed down into the earths core for it to become new again
At subduction zones along convergent plate boundaries.
At a convergent boundary. if seafloor is created at a divergent boundary then it must be the opposite (at a convergent boundary) where is being destroyed.
At a convergent boundary. if seafloor is created at a divergent boundary then it must be the opposite (at a convergent boundary) where is being destroyed.
New oceanic crust is being created at seafloor spreading zones, and crust is alternately being subducted and destroyed at subduction zones.
Rocks in the seafloor are moving one place to another
seafloor spreading
At a convergent boundary. if seafloor is created at a divergent boundary then it must be the opposite (at a convergent boundary) where is being destroyed.
At a convergent boundary. if seafloor is created at a divergent boundary then it must be the opposite (at a convergent boundary) where is being destroyed.
New oceanic crust is being created at seafloor spreading zones, and crust is alternately being subducted and destroyed at subduction zones.
The oldest seafloor is estimated to be around 200 million years old. New oceanic crust is continuously formed at mid-ocean ridges, so the seafloor is constantly being recycled.
No, the theory is that Seafloor spreading state that the new ocean crust is formed at ocean ridges and is destroyed at deep sea trenches.
The oldest rock are up to 125 million years old.
At divergent plate boundaries the spreading of the tectonic plates results in the reduced pressure of the underlying magma. As the spreading continues, lava fills in the area of spreading and cools, becoming the newest addition to the seafloor. This process occurs at a steady rate ranging from a few centimeters to several centimeters of new sea floor each year. However, at a different location opposite the newly formed seafloor are convergent plate boundaries where land and seafloor is destroyed to make room for new seafloor.
Seafloor Spreading
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.
Rocks in the seafloor are moving one place to another
seafloor spreading