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P5 SCI

In the last part of the 20th century, modern investigations have led to the evidence of sea-floor spreading or the diversion of ocean floor from the mod-ocean ridges.
Under geometric continental reconstructions evidence, Wegener proposed that the coastline geography of the continents on either side of the Atlantic Ocean have pattern and can be fitted back together like a jigsaw puzzle. Example of which are the coastlines of western Africa and eastern South America (Rogers, 2008). In addition, Wegener reiterated it is the end of the submerged continental shelf that marks the line of the originally joined continents and not the coastline-fit misconception. Geological match and continuity of structure evidence explained how there are similar rock types, succession of strata or igneous bodies which have unique characteristics were found on either side of the ocean.
This evidence was observed in the similarities of the rock strata and geological structures of the Appalachian and Caledonian mountain belts of eastern USA and northwestern Europe, as well as the Precambrian rocks and geological structures similarity observed between South America and Africa (Rogers, 2008). The third evidence is the climate, sediment and mismatch of sedimentary deposits, which explained that the nature and style of rock weathering and erosion varies among Earth climate belts. This explained why sand dunes are formed in hot, dry desserts, cool and sandstone succession in tropical swamps and river deltas, and boulder clay deposits and U-shaped valleys in ice sheets and glaciers areas (Rogers, 2008). The modern evidence gathered during the latter part of the 20th century, which has made the continental drift theory acceptable, is the sea-floor spreading evidence. Modern geologists had explained the inaccessible ocean floor in Wegener’s theory and discovered striped patterns of magnetic ...Show more

Summary

The essay aims to address a two-fold objective to wit: (1) to explain the continental drift theory by Alfred Wegener; and (2) to relate scientific methods and theory development to the acceptance and resistance of the continental drift theory.
Alfred Wegener is the German…
Author : mariannacronin
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