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14 Cards in this Set
- Front
- Back
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Name the layers of the earth starting from low density upwards.
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crust
mantle outer core inner core |
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what is the mantle made of?
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magma
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what is the outer core made of?
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liquid iron and nickel
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What's the inner core made of and why is it solid?
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solid iron nickel, it's solid because of the pressure it is under from the magnetic field.
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describe the continental crust?
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relatively light, made up from rock (igneous, sedimentary and metamorphic)
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describe the oceanic crust
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relatively heavy and made up of basalt
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what separates the crust from the mantle?
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moho
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what is continental drift, who's theory was it and what was the evidence?
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continental drift is the theory that millions of years ago all the continents were joined together as a super continent (Pangea). Theory was put forward by Alfred Wegener with 3 main pieces of evidence
1) the jigsaw fit of the continents 2) fossils (identical fossils were found in America and Africa) 3) Geology (rock types) matched in different continents |
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what force causes tectonic plate movement?
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convection currents in the magma
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in which 3 ways do the plates move?
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together, apart and past each other
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What is a destructive plate boundary, what happens and what is produced?
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oceanic and continental plates meet. oceanic plate more dense and therefore dips under continental plate into the magma and the oceanic plate is destroyed
-makes a deep ocean trench and a mountain range with volcanoes |
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collision zone
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continental + continental
equal density means no subduction. they crash together and throw up huge mountain ranges, where the plates meet - fault lines along which you get earthquakes (eg the Himalayas) |
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what is a constructive plate boundary, what happens and what is produced?
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Plates moving apart, as they move apart a gap is formed which is then filled with magma which solidifies to make new rock - under sea mountain ranges (The Atlantic Ocean)
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What is a conservative plate boundary, what happens and what is produced?
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Plates slide past eachother, rock is conserved. Earthquakes are found here (Eg San Andreas Faults - San Francisco)
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