The metamorphic rocks are transformed from the existing rock types. They change with the changes in pressure and temperature. They cover large parts of the earth's crust make up 12% of the earth.
They are made by tectonic processes such as continental collision. That leads to horizontal pressure and distortions some examples may include the gneiss, marble, slate, schist, and quartzite.
hand a rock to another person and do that in a line what makes it effecent is the fact that one person doesn't have to bring the rocks back and forth on there own
