When Alfred Wegener first presented a hypothesis of continental drift in 1912, he suggested that continents ploughed through the ocean crust. |
No mechanism was known, for example for continental drift when it was proposed by Wegener. |
Georgi had asked Wegener to coordinate an expedition to establish a winter weather station to study the jet stream in the upper atmosphere. |
The anthelion is a spot on the parhelic circle, where the Wegener arcs, the Hastings arcs and the Tricker arcs cross the parhelic circle and increase the brightness. |
Wegener studied plant fossils from the frigid Arctic of Svalbard, Norway. |
For example, when Wegener proposed his theory of continental drift he could not explain how continents move. |