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in Origin of Continents and Oceans by (58.5k points)
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Explain the plate margins. 

Or 

How many types of plate edges are there? Explain them.

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Plate tectonic theory is dependent on plate margins because most tectonic events occur with the help of plate edges. 

These plate margins are divided into the following parts:

1. Constructive Plate Margins: With the help of these edges, two plates are deflected, due to which the empty space is formed. There is a regional expansion due to the magma coming out and accumulating in the form of lava. Therefore they are called creative edges. They are found on the Atlantic Ridge. 

2. Destructive Plate Margins: Due to the convergence of two plates, with the help of . these edges, one plate climbs over the other and the second plate undergoes ablation. The front edge of the avalanche plate melts when it breaks down into the mantle. Hence it is called the Destructive Strand. This molten substance reaches out of weak crust and creates volcanic and island arc. Island arc and volcanic range is wide on the shores of Pacific Ocean Plate.

3. Conservative Plate Margins: With the help of these edges, two plates move side by side. There is neither plate erosion nor new material is created there. Only transform faults are formed. Hence it is called the protective shore. In the western part of North America, San Andreas is the protective side of the two sub-plates, with the help of prolapse. These form of plate margins are shown with the help of the above figure.

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