What part of the brain is the arrow pointing to?

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

Can someone i have no idea of how to do this.