Describe geographic evidence collected in the last part of the 20th century to support the theory of continental drift.
Some of the geographical evidence collected in the last part of the 20th century to support the theory of the continental drift is the discovery of plate tectonics Hess and Deitz modified the theory called "Sea-floor Spreading". Along the seafloor features that supported the sea-floor spreading hypothesis were: mid-oceanic ridges, deep sea trenches, island arcs, geomagnetic patterns, and fault patterns. ancient fossils found on different continents were often similar or identical, the exploring naturalists were finding out that living plants and animals on the different continents were often very different. new groups of animals and plants were found on almost every island and continent they visited. Most biological species seemed to be unique to the region or continent in which they were found. these seemingly contradictory observations can be seen through Plate tectonics . When the different land masses were connected, the same or closely related plants and animals inhabited each. After the land masses were separated, the different species were geographically isolated from one other by the waters of the ocean. Life on the different continents had evolved into different species, because the populations were separated from each other by such great distances.
It is possible to link, the breakup of the continents with the types of animals found on each. The longer the period of separation, the more differences between species were found because they had evolved. For example, all of the indigenous mammals found in Australia are marsupials. There are no naturally occurring placental mammals. This suggests that Australia broke away before the mammals had evolved. In geographic isolation from the rest of the world, Australia's mammals were able to evolve into many highly sophisticated forms found nowhere else.
The diversity of life on Earth increased as a result of the breakup of the supercontinents. This idea was first proposed in 1970 by the American geologists James W. Valentine and Eldridge M. Moores. They suggested that the diversity of life increased as continents broke up and moved apart and decreased as land masses moved together and joined.
Why do scientists today accept the movement of continents but did not accept this theory back in Wegner’s time?
Scientists accept the theory of the continental drift today but didn’t accept it then because when Wegener first came up with the theory of the continental drift he suggeststed that continental rocks were stronger and lighter than seafloor rocks and that the seafloor rocks were like very thick tar. He concluded that the stronger continents were able to drift around on the weaker seafloor rocks. Wegener thought the continents had once been part of a single called Pangaea. Unfortunately, Wegener could not suggest any mechanism that would have caused the...