Created by eimearkelly3
over 11 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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