9.1: Continental Drift.

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Presentation transcript:

9.1: Continental Drift

continental drift: hypothesis that continents once formed a single landmass, broke up, & drifted to their present location first proposed by Alfred Wegener in 1912 called the single landmass Pangaea which means “all land”

Wegener first noticed how the continents fit together like a puzzle

Wegener used several different types of evidence to support his hypothesis: fossils rock formations climatic evidence

matching fossils on different continents

matching rock formations – same age & type – on different continents

glacial deposits and grooves in warm areas

coal deposits – formed from plants in warm, wet regions – are found in cold areas (Siberia!)

Wegener said the continents moved by plowing through the rock of the ocean floor was disproven by geologic evidence so continental drift was discounted because Wegener couldn’t explain HOW it occurred