I think that they can either use fossils or age of rocks
Answer:
Cooling
Explanation:
Metamorphic Rock to point K to Magma to point V to Igneous Rock to Heat and Pressure.
Point V would be cooling,
In the rock cycle, one rock can turn into another rock. A metamorphic rock can turn into an igneous rock through 2 process, namely melting and cooling. If a metamorphic will undergo tremendous heat, it could melt into magma. If magma cools down it would turn into an igneous rock.
In summary:
Metamorphic rock→ melting (Point K)→magma→cooling (Point V)→Igneous Rock
Division of ethnic groups to different parts of the continent
