Expedited Passport Service: Orland Park Post Office IL provides expedited passport service with a two (2) to four (4) week turnaround time in Orland Park.
1 Seafloor spreading is one of the two major processes of plate tectonics, the other being subduction. 2  Seafloor spreading is the continuous process of forming new igneous rock at midocean ridges by injection of magma that forms new seafloor. Seafloor spreading is one of the two major processes of plate tectonics, the other being subduction. 2  Seafloor spreading is the continuous process of forming new igneous rock at midocean ridges by injection of magma that forms new seafloor.
1 At the point where two plates collide, one plate may be pushed under the other plate, so that it sinks into the mantle. 2  This process, called subduction, typically forms a trench, a very deep ditch, usually in the ocean floor. 3  As the rigid lithosphere pushes down into the hot, high-pressure mantle, it heats up. This sort of magma production is called subduction zone volcanism. 2  If the plates collide and neither plate can subduct under the other, the crust material will just crumple, pushing up mountains. 3  This process does not produce volcanoes.