The earths structure 2.0 / 5 based on 1 rating ? ChemistryThe earth and its atmosphereGCSEAQA Created by: Izzy SharmaCreated on: 29-01-13 20:21 Crust- how thick? 20 km or so 1 of 16 Mantle- solid or liquid? How thick? Liquid and viscous 2 of 16 Core- how big? Made from? Where? Just over half earths radius, made from iron and nickel where earths magnetic field originates 3 of 16 What happened to the iron and nickel, why? Sank to the bottom, long ago (centre earth), because denser 4 of 16 Core has a ....inner bit and a .... Outer bit Solid inner, liquid outer 5 of 16 What creates all the heat inside the earth? Radioactive decay 6 of 16 What does the heat cause? Convection currents, which cause the plates of crust to move. 7 of 16 Overall density of earth is ... Than density of rock. This means... Higher, the inside must be made of something denser than rock. 8 of 16 Meteorites which crash to earth are made of... Iron and nickel 9 of 16 Iron and nickel are.... Magnetic and very dense 10 of 16 So if core made of iron and nickel, would suggest why the high density of earth is due to ..... Magnetic field around it 11 of 16 By following paths of seismic waves from earthquakes as they travel through the earth tells us ... There is a change to liquid about half way through the earth 12 of 16 Therefore we get a liquid outer layer, the seismic waves also indicate a ..... Inner core Solid 13 of 16 What are the plates like? Big rafts which float across liquid mantle 14 of 16 As plates more the ..... Move too Continents 15 of 16 Plates move at a speed of about 1 /2 cm per year 16 of 16
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