Explain why continually pounding a rock with a sledge hammer will not produce a metamorphic rock.?

Question

Can you Explain this?? I cant.

Explain why continually pounding a rock with a sledge hammer will not produce a metamorphic rock.

Answer 1

It will be the same rock as before, just a bunch of pieces of it.

Answer 2

To form a metamorphic rock such as gneiss from an igneous rock such as granite, it has to be exposed to very high pressure on the order of 10,000 bars or more, and heat in excess of 2000 degrees underground. The same is true for changing a sedimentary rock such as limestone into a metamorphic rock such as marble. A bar is the air pressure at sea level, so you get the idea of the huge pressures 10 or 20 miles under the ground. Usually a mass of magma intrudes into the crust without breaking through to the surface, pooling in vast masses called batholiths that can cover hundreds of square miles, Around the edges of this mass of magma, the high temperature and pressures cause rocks to re-crystallize into into new forms that are stable under the higher temperatures. That is why hammering a rock won't change it into a metamorphic rock, it takes exposure to massive pressure and intense heat over a long period of time to do that. It is possible to duplicate these conditions in the laboratory, and that is how synthetic diamonds are made.