Types of convection

There is a accepted agitation aural the geophysics association as to whether alteration is acceptable to be 'layered' or 'whole'.[8] This agitation is affiliated to the altercation apropos whether intraplate volcanism is acquired by shallow, upper-mantle processes or by plumes from the lower mantle.[6] Geochemists accept argued that the lavas erupted in intraplate areas are altered in agreement from shallow-derived mid ocean backbone basalts (SDMORB). This has been interpreted as their basic from a altered region, appropriate to be the lower mantle. Others, however, accept acicular out that the differences announce the admittance of a baby basic of near-surface actual from the lithosphere. Seismologists are aswell divided, with some arguing that there is no affirmation for whole-mantle convection,[9] and others arguing that there is.[10]