Final answer:
The geometric similarity of the Grand Canyon to the Rhine Graben is not an example of evidence for continental drift. Evidence for continental drift typically includes similarities in mountain ranges, matching geological structures across continents, and shared sedimentary sequences from former supercontinents.
Step-by-step explanation:
The question asks which of the following is not an example of a rock type similarity cited as evidence for continental drift: 1) the structural similarity of the Appalachian Mountains in eastern North America and the Caledonian Mountains in northern Europe; 2) matching segments of Archean crust in Africa and South America; 3) the geometric similarity of the Grand Canyon in western North America to the Rhine Graben in Germany; 4) the widespread presence of the Gondwana Succession; 5) none of the above.The correct main answer is 3) the geometric similarity of the Grand Canyon in western North America to the Rhine Graben in Germany. This is not an example cited as evidence for continental drift because the similarities between the Grand Canyon and the Rhine Graben are not commonly referenced in the context of continental drift or plate tectonics. Instead, they are separate geologic features formed by different processes. Whereas similarities in mountain ranges (like the Appalachian and Caledonian) and matching geological structures across continents are some key evidences that support the theory of continental drift initially proposed by Alfred Wegener. The Gondwana Succession refers to sedimentary sequences that are found in regions that once formed part of the supercontinent Gondwana, therefore also supporting continental drift.In conclusion, the geometric similarity of distinct geographic features like the Grand Canyon and the Rhine Graben does not constitute evidence for continental drift, unlike the structural similarities in mountain ranges and the presence of certain rock formations across now-separated continents.