Question
Explain continental drift. Discus the evidences in favour of the continental drift theory with its criticism.
Answer :
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Continental drift is the theory proposed by the German meteorologist and geophysicist Alfred Wegener in 1912, which states that the continents were once united into a single supercontinent called Pangaea and gradually drifted apart to occupy their present positions. According to Wegener, around 300 million years ago, Pangaea was surrounded by a vast ocean known as Panthalassa. Later, Pangaea split into two major landmasses: Laurasia in the north and Gondwanaland in the south. These further fragmented and slowly moved across the Earth's surface, giving rise to the present continents. Wegener suggested that continents consisted of lighter sialic material floating over denser sima, allowing them to move. Although he could not satisfactorily explain the force responsible for this movement, his hypothesis laid the foundation for modern plate tectonic theory. One of the strongest evidences supporting continental drift is the remarkable fit of continental margins. The eastern coast of South America closely matches the western coast of Africa, while other continental boundaries also appear to fit together like pieces of a jigsaw puzzle. This geometric correspondence suggests that these continents were once joined. Geological evidence also strongly supports the theory. Rock formations, mountain ranges, and geological structures of the same age and composition are found on continents now separated by oceans. The Appalachian Mountains of North America correspond with the Caledonian Mountains of Scotland and Scandinavia. Similarly, ancient rock formations in Brazil closely resemble those in West Africa, indicating a common geological history. Fossil evidence provides another convincing argument. Fossils of identical plant and
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