Question 4(multiple choice worth 3 points) which of the following formed at a convergent plate tectonic boundary? marianas trench mid-atlantic ridge molokai fracture zone san andreas fault great rift valley

Option (1)

Explanation:

The earth is made up of numerous small and large plates and they are considered as the lithospheric plates. They are of two types, namely the continental plate (crust) and the oceanic plate (crust). These plates constantly move over the layer of Asthenosphere due to the convection current that forms in the mantle. This currents are formed due to the heat energy radiated from the core of the earth.

This plate motion takes places in three forms, such as-

(a) Divergent plate motion

(b) Convergent plate motion

(c) Transform plate motion

In a convergent plate motion, two plates moves towards each other. It can be either continental-continental or oceanic-oceanic or oceanic continental collision. Due to this crashing of the plates, a subduction zone is formed that is marked by a deep sea trench and deep-focus earthquakes are generated. Also volcanic and island arcs are formed.

The Mariana trench is formed due to the collision between the Pacific plate and the Phillipine plate. It is the world's deepest trench having a depth of approximately 11 km.

Hence, the correct answer is option (1).

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