I m sorry you somehow found this.
Sea floor spreading and subduction animation.
This animation depicts a 100 000 year time span of seafloor spreading.
Have you noticed lately that your students just aren t listening when you try to teac.
Because of these processes the ocean floor is renewed about every 200 million years.
Seafloor spreading is just one part of plate tectonics.
Subduction is one of the two major processes of plate tectonics the other being seafloor spreading.
The process of subduction and sea floor spreading can change the size and shape of the oceans.
That is the time it takes for new rock to form at the mid ocean ridge move atoss the ocean and sink into a trench.
At subduction zones the edge of the denser plate subducts or slides beneath the less dense one.
It also shows the subduction of oceanic crust under continental crust and the resulting formation of magma and subsequent volcanism.
I didn t know it would come to this.
Subduction happens where tectonic plates crash into each other instead of spreading apart.
Seafloor spreading is one of the two major processes of plate tectonics the other being subduction.
A subduction zone is the entire area of subduction between the trench and the volcanic arc.
The denser lithospheric material then melts back into the earth s mantle.
As upwelling of magma continues the plates continue to diverge a process known as seafloor spreading samples collected from the ocean floor show that the age of oceanic crust increases with distance from the spreading centre important evidence in favour of this process.
Spreading rates determine if the ridge is fast intermediate or slow.
These age data also allow the rate of seafloor spreading to be determined and they show that rates.
Seafloor spreading and plate boundaries.
Trenches accretionary wedges prisms and volcanic or island arcs are key surface features produced by subduction.
The rate at which new oceanic lithosphere is added to each tectonic plate on either side of a mid ocean ridge is the spreading half rate and is equal to half of the spreading rate.
Seafloor spreading is the continuous process of forming new igneous rock at midocean ridges by injection of magma that forms new seafloor.
