The southernmost mountain system in South America and the southernmost mountain system in Africa have the same geological structure, the same minerals, and the same age as the mountains. If the two continents of the United States and Africa are moved together, they will become the same mountain system. What can't be concluded from the materials? ['Is there anything on earth?', 'The continent is not static but drifts slowly and continuously.', 'Yamahara, the original part of the mainland, was separated.', 'Identical geological formations on different continents.']