This showed that greenfinch and starling numbers were continuing to decline, but reaffirmed the success of the house sparrow, which topped the Welsh and UK surveys.
Alfred Wegener (1880 - 1930). Alfred Wegener proposed the theory of continental drift at the beginning of the 20th century. His idea was that the Earth's continents were once joined together, but gradually moved apart over millions of years.his slideshow explains Wegener's theory. Earth around 200 million years ago, at the time of Pangaea. Wegenerâs evidence for continental drift was that: 1  the same types of fossilised animals and plants are found in South America and Africa.
Continental drift referred to the concept that the Earth's continents were once part of a large supercontinent and had subsequently split apart and arrived at their present destinations.