Continental drift Continental drift Continental drift is the theory that the Earth's continents have moved over geologic time relative to each other, thus appearing to have "drifted" across the ocean bed. The speculation that continents might have 'drifted' was first put forward by Abraham Ortelius in 1596. The concept was independently and more fully developed by Alfred Wegener in 1912, but his theory was rejected by many for lack of any motive mechanism. Arthur Holmes later proposed mantle convection for that mechanism. The idea of continental drift has since been subsumed by the theory of plate tectonics, which explains that the continents
Drift migration known as a fallout, though in the latter case, it need not involve vagrant birds. An example would be an east wind in September blowing Scandinavian migrants such as bluethroats, wrynecks, and the continental race of robin onto the east coast of England and Scotland, leading to temporary concentrations of these species at headlands like Spurn. Drift migration Drift migration is the phenomenon in which migrating birds are blown off course by the winds while they are in flight. It is more likely to happen to birds heading south in autumn because the large numbers of inexperienced young birds are