Essays Tagged: "Oceanic Crust"

Plate Tectonics.

and in their change in position relative to each other. Sea-floor spreading is the creation of new oceanic crust at mid-ocean ridges and movement of the crust away from the mid-ocean ridges. Plate Bo ... nd the initial point of descent is marked on the surface by a deep ocean trench. When two plates of oceanic crust collide a volcanic island arc may form. As one of the plates is subducted beneath the ...

(3 pages) 142 1 2.2 Nov/2003

Subjects: Science Essays > Earth Sciences > Geology & Geosciences


t boundary. This is where two plates are been pulled apart because of tension. This then allows new oceanic crust to be made in the divergent boundary, as magma rises and eventually sets on the sea fl ... es at divergent boundaries. When the tension pulling apart the two plates becomes too much then the oceanic crust will fracture. This fracturing is caused by many normal faults happening as shown in t ...

(6 pages) 143 0 4.8 Feb/2004

Subjects: Science Essays

Living With Earthquakes - Locations and Tectonic Theory & Coping With Earthquakes

umpled and there is a great amount of tension.Another type is a constructive margin. Here, when two Oceanic Plates move away from one another, magma rises to the surface, creating new crust. A good ex ... ve margin, such as the one between the South American Plate and the Nazca Plate. This is when dense Oceanic Crust sinks down beneath less dense Continental Crust, and re-melts to become part of the ma ...

(5 pages) 92 0 5.0 Jul/2004

Subjects: Science Essays > Earth Sciences > Geography

Eruption of Mt. Saint Helens in 1980

in the United States. Cascades mountain range settles on a destructive margin. Juan De Fuca plate (oceanic crust) moved towards the North American Plate (Continental Crust) and formed Cascades mounta ...

(2 pages) 12 0 0.0 May/2006

Subjects: Science Essays > Earth Sciences > Geography