Which of the following pairs of rocks is not correctly shown?

The pair of rocks that is not correctly shown is shale → graphite. Shale is a sedimentary rock composed of mud or clay particles that have compacted over time. Graphite, on the other hand, is a mineral that is formed from the metamorphism of carbon-rich rocks such as limestone or shale. While shale can undergo metamorphism to become slate, it does not naturally transform into graphite. Graphite is formed under very specific geological conditions that involve the high temperature and pressure necessary for the carbon in the rock to re-crystallize into the mineral graphite. Therefore, the pair of rocks that is not correctly shown is shale → graphite.