Plate margins

Geography Assessment!

A. A constructive margin is based on the movement & separation of two plates, when they separate the molten rock and magma that is above of the plates, risesand fills all the gaps that the separation left, then it solidifies and creates a and new oceanic crust forming a mid oceanic ridge were volcanoes occur.B. At destructive plate margins, an oceanic plate moves to a continental or another oceanic plate and it disappears into the mantle of the it . At this zone, it is forced to move down,then as a consequence the pressure at the margins increases and they generally that when it produces Strong earthquakes .
After this the heat produced by the friction of the plates turns thecrust material into magma later on the magma tries to rise up to the surface creating huge volcanoes and volcanic eruptions .

C. A collision margins occurs when two plates move and hittogether, creating a continental crust, as a product of this action, the land between the two plates is pushed up and creates the mountains , like the Himalayas .The earthquakes are very common, they are caused by the collisions between the margins . Their level or intensity vary depending on the location and the strength of the motion.



D. At aconservative plate margins the earthquakes occur because two plates try to slide each other in a very slowly way. It is very common that the two plates touch and start making a lot of pressurethen as a resultant force the pressure is released causing a huge earthquake .The San Andreas fault is an accurate example as California is above the North American and Pacific plates.Bibliography :

http://earthquake.usgs.gov/learn/topics/plate_tectonics/rift_man.php
http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0098946.html