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4 Cards in this Set
- Front
- Back
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Plates |
-CONTINENTAL: thicker, denser, older, mainly asl, variantion -OCEANIC: thinner, lighters, not diverse, young oldest 180mya atm. |
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Support of theory |
-FITTING TOGETHER: parallelism of continental margins, line up. -AGE AND TYPE: rock ages and types align along costs SA & A -GLACIAL GROOVE -FOSSILS -WHY'D IT FAIL: internal structure was unknown, could not explain mechanism for movement. |
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Sea floor spreading Ocean ridges |
-diverging oceanic plates form new ocean floor at oceanic Mountain ridges. Long ridges defining plate boundaries. Create magnetically alternating patterns/stripes on either side. Older with distance from the ridge. |
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Wilson cycle |
-continents drift, form ocean -ocean spreads -ocean subducts below another continental plate -ocean decreases in size -continents converge -Mountains are formed -cycle continues, oceans are born and die, continents are preserved and grow with time. Eg: East African rift, samali plate moving away Eg: dead sea formed as African and Arabian plate diverge. |
