Which metamorphic rock forms under the highest temperature and highest pressure?

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.

answer; i believe the correct answer is (clockwise and outward) about the center;

the first plants to make the transition

explanation: