Book Creator

Act 2

by Hala


The history of Pangaea
Earth began as a single landmass or supercontinent called Pangaea. The word Pangaea came from the Greek words pan which means “all” and Gaea which means ‘’earth’’. Also, it can translate to ‘’all lands’’. It was surrounded by a vast sea or supercontinent called Panthalassa, which means ‘’all seas’’. It existed during the late Paleozoic and early Mesozoic eras. It assembled from continental units 335 million years ago and began to break apart about 200 million years ago, at the end of the Triassic and beginning of the Jurassic. The continents were joined together and then drifted apart as a result of tectonic forces. These continents are cradled by continental tectonic plates found on the lithosphere.
Pangaea is the most recent supercontinent to have existed and the first to be reconstructed by geologists.
Here is a picture of how it looked years ago and how it looks now. (at the present day/time)
    The person that discovered Pangaea
Alfred Wegener is the scientist credited for establishing the foundation for the theory of plate tectonics. Wegener originally proposed that the breakup of Pangaea was due to centripetal forces from the Earth's rotation acting on the high continents. However, this mechanism was easily shown to be physically implausible, which delayed the acceptance of the Pangaea hypothesis. Arthur Holmes proposed the more plausible mechanism of mantle convection, which, together with evidence provided by the mapping of the ocean floor following the Second World War, led to the development and acceptance of the theory of plate tectonics. This theory provides the now widely-accepted explanation for the existence and breakup of Pangaea. 
Also, the contraction theory was superseded by the theory of continental drift proposed by Alfred Wegener. The contraction theory was one of the earliest theories on the changing geography and surface topography of the earth. The theory suggested that as the earth cooled after its formation, its surface contracted and wrinkled, and with these wrinkles were the mountain ranges on the earth's surface. Furthermore, the theory also assumed that all other features on earth were formed during a single cooling event and that the planet was relatively static, without any significant change since the cooling and winkling slowed to a halt.
Wegener’s theory was based upon his observations which included the apparent fit of the eastern coastline of South America and the western coastline of Africa. And the similarities of plant and animal fossils in South America and some parts of the African continent, which were separated by a vast ocean. And similarities in the sequences of rock layers on opposite sides of the Atlantic Ocean.                                                                                                   
The evidence of the existence of Pangaea
The first piece of evidence which proves the theory of continental drift is all of the continents fit together like puzzle pieces in a jigsaw puzzle. Furthermore, if you connect all of the continents, they fit perfectly together, proving that they were all once connected. this proved the existence of Pangaea