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Abraham Ortelius, a Flemish cartographer, noticed that the coastlines of the continents fit together; he suggested that they were once connected.
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Nicolas Steno published De Solido Intra Solidum Naturaliter Contento Dissertationis Prodromus to discuss how solids, such as fossils or minerals, could be found within other solids (rocks).
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The German meteorologist Alfred Wegener suggested that the continents were once joined together.
https://docs.google.com/document/d/161FpBaGEVdRe9-37BMbAT0F563MAElm-zSrXXxM-8WY/edit -
The Swedish botanist Eric Hultén used plant evidence to support the theory of Beringia, a land bridge connecting present day Alaska to Russia. This theory was commonly used to argue the continental drift theory.
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Harry Hess developed the idea of seafloor spreading, which eventually lead to the modern plate tectonic theory, supporting the continental drift theory.