Structure of the earth 4.0 / 5 based on 1 rating ? GeographyPlate tectonicsA2/A-levelAQA Created by: SakriehellCreated on: 17-05-17 19:56 What shape is the earth? Geoid 1 of 16 What causes the earths shape? Centrifugal forces 2 of 16 What is the outer shell of the earth? Crust 3 of 16 How thick is the crust? Up to 70km 4 of 16 What is oceanic crust made of? Sima 5 of 16 What is continental crust made of? Sial 6 of 16 What is sial? Silica and aluminium 7 of 16 What is sima? Silica and magnesium 8 of 16 What is the lithosphere? Crust and upper mantle 9 of 16 What is the asthenosphere? Very soft rock up to 250km into the mantle 10 of 16 What is the core made of? Iron and nickel 11 of 16 What temperature is the core? 5000c 12 of 16 What creates the earths magnetic field? Spinning of the outer core 13 of 16 What is the outer core made of? Iron 14 of 16 What is the inner core made of? Iron-nickel alloy 15 of 16 What generates convection currents? Heat of the core 16 of 16
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