which piece of evidence did Alfred Wegener original theory of continental drift have access to A seafloor spreading at mid ocean ridges B reversing paleomagnetism in rocks on the ocean floor, C evidence of ancient tropical swamps in cold regions of north American or D a seafloor that was geologically active with earthquakes, volcanoes, and mountain chains

Answer 1

Alfred Wegener's original theory of continental drift primarily relied on the following piece of evidence: C evidence of ancient tropical swamps in cold regions of North America.

Wegener noted the distribution of certain fossil plants and animals, as well as geological formations, that indicated that continents were once connected and had drifted apart over geological time. He observed that similar fossils of tropical plants were found in now cold regions, such as the coal deposits in Antarctica and North America, supporting his idea that continents had moved to their current positions from previously connected locations.

The other options (A, B, and D) relate more to the developments that came after Wegener's initial hypothesis, particularly the theory of plate tectonics that incorporated evidence of seafloor spreading, paleomagnetism, and tectonic activity.