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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.
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Occurs when species that were similar become increasingly distinct?
Divergent evolution:)
Place where seafloor spreading occurs?
Seafloor spreading occurs at the boundary between two tectonic plates. As the plates divide, magma comes up through the crack and cools to form new sea floor. The farther away the floor is from the boundary, the older it is.
What is another name for the orographic effect?
The orographic effect occurs when winf from over the ocean passes over a mountain and the lack of rain creates a desert on the other side.
Where does polyadenylation occur?
Polyadenylation occurs at the 3' end (the back) of an mRNA strand in the nucleus of the cell. This act of polyadenylation creates a polyadenine (polyA) tail. mRNA cannot leave the nucleus of the cell unless polyadenylation occurs. PolyA tails seem to protect integrity of the mRNA molecule, which is exposed to multiple proteins that can degrade it once shipped to the cytoplasm
Why does the elevation gradually decrease away from the ridge axis?
Hot material ascends at the ridge axis form the mantle. It partially melts. The basaltic melts ascend and form 6-7 km of oceanic crust. The seafloor and the underlying mantle then move away from the ridge axis. The material cools from top down. As it does it contracts thermally and becomes more dense. The vertical contraction of the material and the increased load on the underlying mantle causes the seafloor to subside. The weight of the overlying water also causes subsidence. To the first order, the predicted depth to the seafloor increases with the square root of age from the ridge axis. This in fact occurs and was strong evidence for the reality of seafloor spreading in the late 1960s. Note that Lord Kelvin was on the trans-Atlantic cable project. He crossed the Charlie-Gibbs fracture zone rather than the ridge axis. The square-root relationship was not evident. Wegener also considered the process to some extent, but ended up with continents moving as rafts rather than with seafloor spreading. See paper for technical derivation and some early references. 2011 Sleep, N. H., Small-scale convection beneath oceans and continents. Chi. Sci. Bull., 56(13), 1292-1317, DOI: 10.1007/s11434-011-4435-x.
At a divergent boundary land is gained or lost?
At a divergent boundary, land is gained. Ocean ridges are prominent at divergent plate boundaries. Ocean ridges are areas of seafloor spreading. Seafloor spreading occurs as upwelling magma rises to the surface. This upwelling magma hardens and forms new seafloor.
What occurs at plate boundaries that are associated with seafloor spreading?
When seafloor spreading happens, a rift forms at the bottom of a ocean and separates to form new rock. This is an example of a divergent plate boundary
What type of movement occurs at plate boundaries?
Convergent,Divergent, and Transform Boundaries
What type of movement occurs at divergent boundaries?
I cant
What occurs at a divergent boundaries?
Tectonic plates divide
Which type of fault occurs at divergent boundaries?
Normal
Ocean trench occurs at what boundary?
Divergent boundaries.
What is the movement that occurs at each type of boundaries?
divergent boundry
Does sea floor spreading occur at a convergent boundary?
No. Seafloor spreading occurs at a divergent boundary.
What kind of fault occurs at the divergent plate boundaries?
A normal
What type of plate boundary would you find where the sea floor spreads?
Seafloor spreading occurs at divergent plate boundaries under the ocean.
How do you explain the process of the seafloor spreading?
The seafloor spreading definition is the geologic process that occurs at the boundary between 2 plates where molten material within the earth pushes its way up, causing the plates to move away from each other. At these divergent boundaries molten material cools and hardens, creating new oceanic crust or seafloor
