What makes a rock (You should now be at the entrance of Benedum Hall of Geology)

Question

What makes a rock (You should now be at the entrance of Benedum Hall of Geology):

WHAT MAKES A ROCK? Rocks are hard, consolidated mineral matter. Poets may characterize them as permanent and immutable, but scientists know that rocks are constantly changing in a great geologic cycle. The cycle starts with magma, molten matter from deep within the Earth. As soon as igneous rocks formed from magma are exposed on the Earth's surface, they begin to change. They may weather into particles, which are carried away, deposited, and compacted into new kinds of sedimentary rocks. Or they may be moved with the Earth's plates to subduction zones, where they sink and are remelted into magma. Igneous or sedimentary rocks may be changed by heat and pressure within the Earth to metamorphic rocks. These, when exposed on the surface, enter the great cycle in their turn. The Earth retains its size through this recycling, although its surface is constantly weathered and renewed in the endless cycle.

Explanation / Answer

Ans- subduction is a process which is seen in tectonic plates at convergent boundaries. In this the one plate is forced by another plate to come under that plate. Due to gravity one plate moves under the another one and it is forced toward mental.

The regions of the plates which show subduction are known as the subduction zones. Subduction is always in centimeters per year. It may vary from one subduction zone to another.

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