Constructive plate margins occur when tectonic plates move
They move a few cm a year
Over time this meant that whole continents have moved
Conctructive plate margin
Why are Earthquakes and Volcanoes found at Constructive Plate Margins?
1) At Constructive PLate margins, the upper part of the mantle melts and the hot molten magma rises
2) As the tectonic plates move away from eachother by slab pull, magma rises. This forms part of the
oceanic plate. The new plate sometimes fractures which causes Earthquakes.
3) Lots of thye magma never reaches the surface but it is able to push up the crustat constructive plate margins. In some
places the magma erupts to the surfacem, producing lava that is very rinny. :))))))))