<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2008) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2008) (Learn how and when to remove this template message) </Td> </Tr> <P> Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge . </P> <Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (May 2018) </Td> </Tr> </Table>

What is the accepted primary mechanism for seafloor spreading
find me the text answering this question