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Chapter 3 - Chapter 3 Introduction Pangaea the...

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Chapter 3 Introduction Pangaea- the supercontinent suggested by Wegener that later fragmented into separate continents that then drifted apart, moving slowly to their present positions otherwise known as continental drift Sea floor spreading- the idea that continents drift apart because new ocean floor forms between them Subduction- process of ocean floor sinking into the mantle What was Wegener's evidence for continental drift? Fit of the continents: The continents joined like pieces of a jigsaw puzzle with few overlaps or gaps Locations of past glaciations: glaciers moving scrape sediment off the ground and carry it along. Glaciers eventually melt and the sediment collected create a distinctive layer of sediment called glacial till, a mixture of mud, sand, pebbles, and larger rocks. Studying the distribution of glacial till, the glaciers must have covered large areas of continents Distribution of equatorial climatic belts: Late Paleozoic sedimentary rock layer include abundant coal and the relicts of reefs. Subtropical regions on either side of the tropical belt contain deserts. Wegener thought that the distribution of late
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