Explain continental drift and write the evidences in its support. (IFS 2019, 10 Marks)

Introduction
Continental drift is the theory that suggests that the Earth's continents were once joined together as a single supercontinent called Pangaea, and have since drifted apart to their current positions. This theory was proposed by Alfred Wegener in the early 20th century and has been supported by various pieces of evidence from the field of geology, paleontology, and zoology.
Continental drift
Refer to Question IAS 2014.
Evidence Supporting Continental Drift
•    Fossil Evidence
o    Similar Fossils Across Continents: Identical fossil species have been found on continents that are now widely separated by oceans.
    Example: The fossil of Mesosaurus, a freshwater reptile, found in both South America and Africa, suggests that these continents were once connected.
o    Plant Fossils: Fossils of plants like Glossopteris, which are found across South America, Africa, Antarctica, and India, support the theory of continental connection.
•    Geological Evidence
o    Mountain Ranges: Similar geological formations (rock types, age, and structure) found across continents like the Appalachian Mountains in North America and the Caledonian Mountains in Scotland and Scandinavia.
o    Rock Strata: Identical rock strata are found on continents that are now far apart, such as in eastern South America and western Africa.
o    Glacial Evidence: Evidence of past glaciations found in regions that are now located in warmer climates, like the presence of glacial deposits in India, South America, and Antarctica, suggests these regions were once closer to the South Pole.
•    Paleoclimatic Evidence: Evidence of past climates, such as coal deposits in Antarctica and glacial features in present-day warm climates, point to the idea that the continents once had different climates that were more consistent with their prior positions.
•    Fit of the Continents
o    The coastlines of continents like South America and Africa appear to fit together like pieces of a puzzle, which suggests they were once part of a single landmass.
o    The similarity in shape between continents like South America and Africa led to the hypothesis of continental drift, which later developed into the theory of plate tectonics.
•    Seafloor Spreading
o    The discovery of mid-ocean ridges and symmetric patterns of magnetic reversals on either side of the ridges supported the idea of seafloor spreading, a process that also explained the movement of continents.
o    The age of the ocean floor increases with distance from the ridges, supporting the idea of new crust being formed and continents moving apart.
•    Distribution of Earthquakes and Volcanoes
o    Earthquakes and volcanoes are concentrated along plate boundaries, indicating that these boundaries are active regions where continents and oceanic plates are interacting.
o    The Ring of Fire, which is associated with the Pacific Ocean, is a zone of high seismic activity, consistent with plate tectonic theories.
Conclusion
The theory of continental drift is supported by a wealth of evidence from various scientific disciplines, including zoology. The distribution of fossils, living species, and geological features across continents provides compelling evidence for the movement of landmasses over time.