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11 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Name the 6 layers of the earth
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crust, lithosphere, asthenoshpere (semi molten mantle), mantle, outer core, inner core
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Describe how the plates move
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-radio active decay generates heat
-rising of less dense heated magma, fall of denser cool -these circular movements are called convection currents -convection currents in the asthenoshpere cause drag an the base of plates, making them move |
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name the process of the sea floor widening
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sea floor spreading
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Alfred Wegner proposed what theory
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continental drift
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what is the study of the history of the earths magnetic field and what does it cause
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palaeomagentism
causes alternating magnetic stripes on the sea floor |
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what are the 5 pieces of evidence for continental drift
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■ geology, south America and Africa have rocks of the same age and composition whose distribution matches up
■ fossil records, distribution of fossils across continents suggest land masses were once joined. it is unlikely that these organisms migrated across oceans or evolved the same way in different places ■ living species(simular to fissil records, some animals like earthworms are found on different continents ■ Climatology, simular glacial deposits across Antarctica, Africa, India and Australia ■ Palaeomagentism |
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name the 3 types of plate margin
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Destructive, constructive, conservative,
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which margins do not cause volcanoes
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destructive (continental/continental)
conservative |
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features of a constructive margin
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rift valleys (continental/continental) (e.g. Mid-Atlantic Ridge at eurasian and N. American plates)
mid ocean ridge (oceanic/oceanic) (e.g. East African rift system between Nubian and Somalian plates) volcanoes (e.g. kilimanjaro) underwater volcanoes earthquakes |
normally several km deep and thousands of km long
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features of destructive margins
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deep sea trenches (c/o and o/o) (e.g. Peru-Chile trench in the Pacific)
fold mountains (c/o and c/c) (e.g. Himalayas) island arcs (e.g. Mariana islands) earthquakes and volcanoes |
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features of a conservative matgin
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fault lines (e.g. san andreas fault in california)
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