These age data also allow the rate of seafloor spreading to be determined and they show that rates.
Sea floor spreading and subduction animation.
Seafloor spreading is one of the two major processes of plate tectonics the other being subduction.
Subduction happens where tectonic plates crash into each other instead of spreading apart.
Subduction is one of the two major processes of plate tectonics the other being seafloor spreading.
Because of these processes the ocean floor is renewed about every 200 million years.
At subduction zones the edge of the denser plate subducts or slides beneath the less dense one.
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Trenches accretionary wedges prisms and volcanic or island arcs are key surface features produced by subduction.
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.
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.
This report describes how to build a model of the outer 300 km 180 miles of the earth that can be used to develop a better understanding of the principal features of plate tectonics including sea floor spreading the pattern of magnetic stripes frozen into the sea floor transform faulting thrust faulting subduction and volcanism.
This animation depicts a 100 000 year time span of seafloor spreading.
The process of subduction and sea floor spreading can change the size and shape of the oceans.
It details the upwelling of magma at a midocean ridge along with associated transform faults.
Seafloor spreading is just one part of plate tectonics.
Spreading rate is the rate at which an ocean basin widens due to seafloor spreading.
Spreading rates determine if the ridge is fast intermediate or slow.
Seafloor spreading is the continuous process of forming new igneous rock at midocean ridges by injection of magma that forms new seafloor.
A subduction zone is the entire area of subduction between the trench and the volcanic arc.
