Mod+4+-+Brandon+K


 * convergent -** The convergent boundaries occur where a plate of ocean dives in a process called subduction under a land mass. As the overlaying plate lifts up it also forms mountain ranges. In addition the dividing plate melts and is often spewed out in a volcano eruptions such as those in the Nasca pate and the South American plate that formed the Andes Mountains of South America.At ocean convergences one plate usually dives beneath the other forming deep trenches like the Mariana trench between the Pacific plate and the Juan De Fu ca plate.Or the Himalayan mountains between the Indian plate and the Eurasian plate.

On land giant troughs such as the great rift valley in africa from where plates are tugged apart other examples are the Red sea between the Arabian and African ,the mid atlantic plate between the north american plate and the African plate
 * Divergent-** At Divergent boundaries in the oceans magma from deep in the earths mantle rises toward the surface and pushes apart two or more plates mountains and volcanoes rise along the seam . The process renews the ocean floor and widens the giant basins . A single mid dean ridge system connects the worlds oceans making the ridge the biggest mountain range in the world.

sanfransisco

The san andreas fault in California is an example of a transform boundary where two plates grind past each other along what are called strike slip faults these boundaries don,t produce spectacular features like mountains or oceans but the motion often triggers large earthquakes such as 1906 one that devastated sanfrancisco or the one that triggered the 2004 tsunami in India