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Write an account of tectonic activity, including landforms, which are associated with it.

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Write an account of tectonic activity, including landforms, which are associated with it. Introduction Tectonic activity is based on the Theory first published by Alfred Wegener, which was that of the earth's crust being made up of individual plates. The crust contains several different plates all of which are but into two categories, Oceanic plates or Continental Plates. These plates make the earth's surface "move/travel". Under the earths crust is a layer of magma, the plates ride on the magma and move. Pressure builds up along the boundaries which then produce lots of instability. The types of plate boundaries found on the earths crust are conservative, diverging and convergent. Some of these plates carry ocean and the other plates carry the continent. Boundaries are named by how they meet each other therefore the plates which meet can either be ocean-ocean plates, ocean-continental plates or continental - continental plates. At the point where these boundaries are found there are different landforms associated with it. The landforms are the result of the boundaries meeting each other. ...read more.


The new crust at these plates is formed by the up swell of magma through the gap, which has been made by the diverging boundaries. This creates new crust on the earth's surface. Deep-sea ridges are formed in the gaps between the diverging plates. The ridge forms as the magma rises. Volcanoes form on the diverging boundaries as the intense pressure leads to an eruption of magma. Finally the earthquakes form as the plates move as pressure causes the plates to shake and move. The landforms found at destructive plate boundaries include trenches, volcanoes and earthquakes. Trenches in the sea floor are causes in the area where the plates are subducted. The trench does get deeper the further the subducted plate sinks. Earthquakes are formed under the earths crust and are known as subducted earthquakes. They do not usually cause much damage, as they are so deep within the earths crust. Their shock is absorbed within the mantel. Destructive Plate Boundaries A destructive plate boundary however does not create sea floor it destroys it. ...read more.


The Andean Island is an example of a volcanic arc and island arcs can be found in Japan. Therefore we can see that there are two types of destructive margins and these are oceanic-oceanic and oceanic-continental. They occur as the two plates move towards each other and the less dense plate is subducted under the other. The subducted plate is broken up and melted below the surface. A constructive plate margin is opposite of this and the two plates involved are moving away from each other. This causes new material to rise in the gap made. As we can see from this the two margins mentioned here are opposites of each other but are both the result of plates being moved on the underlying magma below. As mentioned before the constructive plate margins are the cause of sea floor spreading and the destructive plate margins are destroying the earths crust. There is a balance within the earths crust and this means that the rate of sea floor spreading is equal to the amount of crust being destroyed and therefore the earths curst and size is staying the same and not getting any bigger or any smaller. James Cable Geography Miss Haslam ...read more.

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