Divergent plate boundaries

Earths magnetic field is not constant, the poles switch every couple hundred thousand years We know this through the magma that comes out of rift zones: The magma is Fe rich and when it comes out and crzstallizes, you notice that they are aligned in a certian direction– the direciton corresponding to the magnetic field of the Earth A barcode like structure/pattern visible

• Plume formation • East Atlantic Rift valley • Red Sea • Mid Atlantic Ridge

1.Narrow section of mantle is hotter = less dense –> rises 2.

horst and graben structure, normal faulting strike-slip faults too at mature margins

Minor earthquakes, caused by strike slip action/fault

Passive and mostly in the deep ocean environment Except iceland