There are several reasons why many South Americans move from rural to urban areas, but in general many do this because there are more opportunities and higher pay in urban areas.
My preferred way to divide complex numbers is to multiply numerator and denominator by the complex conjugate of the denominator
Answer: Gneiss
Explanation: Gneiss is a metamorphic rock formed from shale at very high temperature and pressure condition. They exhibit a preferred alignment or orientation of platy minerals called foliation. They are coarse grained and exhibit gneissose banding. They are formed from highest grade regional metamorphism with temperature between 450 - 600 degree celcius and pressure between 800 - 1000 mega pascal. They generally occur in cores of fold mountain belts where mountain ranges have been eroded.
