<span>Foliated rocks show different minerals or grains that have been segregated into layers or aligned nonrandomly. Quartzite is an example of a nonfoliated metaphoric rock. The main factor that changes rocks during contact metamorphism is both heat and pressure, but if had to choose one I would select pressure. When shale undergoes metamorphism it becomes slate!</span>
Based on the given description above, the correct answer would be the last option. Based on the given information above when the climatologist finds volcanic ash at the bottom of the core, followed by increasing amounts of dissolved oxygen as she goes to the top of the core sample, this might be because a <span>volcano erupted, followed by a period of increased oxygen in the atmosphere. Hope this answer helps.</span>
C. CO<span>2 and other greenhouse gases slowing the escape of heat from earth. </span>
