Final answer:
The proof for the idea of drifting continents came in the form of analysis of magnetic and seismic patterns. Alfred Wegener proposed the concept of continental drift in 1915 and provided evidence such as fitting continents together, matching fossils and mountain ranges, and paleoclimate evidence.
Step-by-step explanation:
The proof for the long-doubted idea of drifting continents came in the form of analysis of magnetic and seismic patterns. Alfred Wegener proposed the idea of continental drift in 1915, and his evidence included the fitting of continents like puzzle pieces, matching fossils and mountain ranges on separate continents, and paleoclimate evidence. However, his idea faced resistance until the 1960s when scientists like Harry Hess expanded upon it.