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12.1 EVIDENCE FOR CONTINENTAL DRIFT (PART 1) Name: Date: Block: (Reference: pp. 506 - 517 of BC Science 10) • Early maps of the world caused Wegener, in the early 20th century, to propose the continental drift theory. the theory that _________________________________ _____________________________________________ _____________________________________________ THE MAIN EVIDENCE SUPPORTING THE CONTINENTAL DRIFT THEORY Wegener based his conclusions on three main pieces of evidence: 1. THE _____________ ______________ _____ The continents looked as though they might fit together like puzzle pieces. ________ _____________ eastern coastline appears to match __________ western coastline. Continental edges do not fit perfectly, better alignments occurs between the ________________ _____________. The original supercontinent was named _______ by Wegener. pan means all and gaea means Earth 2. MATCHING _____________ ___________ AND ________ There were matching geologic features and rocks on different __________________. Close analysis of rocks around the world suggests that the continents were all _________. ______________ ranges in South America that end at the coastline and then continue in Africa. There have been many similarities in rocks in structures in areas separated by thousands of kilometers of _________. Rocks of the same age and type in Newfoundland, Sweden, Norway, and Scotland. 3. ___________ _______________ Similar fossils have been found in many different locations around the world. There were matching fossils on different _______________. The only explanation is that continents must have been __________ at one time. Examples: ________________fossils, a small fresh water reptile, are found only in southeastern South America and southwestern Africa. Land dwelling ________________ and _______________fossils have been found on the different continents in the southern hemisphere. _______________ fossils, a fern, are found from South America and Africa to Australia, India and Antarctica. Ferns do not grow in cold climates, and no evidence that Antarctica was milder 200 million years ago. So, Antarctica must have been closer to the equator and had a warmer climate. CLIMATE EVIDENCE FOR CONTINENTAL DRIFT Work by many scientists added support to the evidence for continental drift that Wegener had collected. Evidence of ___________ in parts of the world that are now tropical, such as parts of India and Africa. Paleoglaciation: ____________________ _________________________________ ______ ___________, which form from the decomposition of living things (usually tropical swamp material), in Antarctica . SUMMARY: