137358
Description
Flashcards by eimearkelly3, updated more than 1 year ago
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Created by eimearkelly3
over 12 years ago
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| Question | Answer |
| Plate tectonics | The study of the processes that cause the movement of the earth's plates and the landforms that result. |
| What fuels the movement of the plates? | Thermal convection currents |
| Diverging | Seperating |
| Converging | Coming together |
| Sea-floor spreading suggests that.... | the ocean floors widen as nwe rock is formed where plates have split apart |
| e.g. of sea floor spreading | Mid-Atlantic Ridge between Eurasian and North American plates |
| Proof of sea floor spreading | Older at the boundary, younger towards the continents Magnetisms Deposits of sediment folloeing glaciation Young/old volcanic islands |
| Sea-floor spreading was proposed by | Harry Hess 1960s |
| Continental drift suggests that | The continents are transported across th planet by convection currents |
| Supercontinent | Pangaea |
| Ocean surrounding Pangaea | Panthalassa |
| Two main continents after Pangaea | Gondwanaland, Laurasia |
| Proof of continental drift | Coninents fit together like a jigsaw Fossils e.g. South America and Africa Similar mountain trends and rocks |
| What particular fossil helped to prove continental drift? | Mesosaurus remains |
| Three types of plate boundaries | Destructive/convergent Conservative/passive Constructive/divergent |
| e.g. of divergent plate boundary | Eurasian and North American (Mid-Atlantic Ridge) |
| e.g. of passive plate boundary | Pacific (6cm NW per year) and North American (1cm NW per year) San Andreas fault |
| e.g. of destructive plate boundary (oceanic oceanic) | Pacific subducting under Philippine plate (Mariana trench) |
| e.g. of destructive plate (oceanic continental) | The Andes Nazca and South American Plate The Rockies Pacific and North American plates |
| e.g. of destructive plate (continental continental) | Eurasian and Indo-Australian plate (Himilayas) |
| bubbles of magma rising from the mantle | plumes |
| Subduction | a heavier plate sinks underneath a lighter one |
| e.g. of rift where plates are seperating | East African Rift Valley |
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