Chemistry C1 7.2 The restless Earth. 0.0 / 5 ? ChemistryThe earth and its atmosphereGCSEAQA Created by: Atlanta and JacobCreated on: 10-07-16 21:08 What is the Earth's crust and upper mantle cracked into? Tectonic plates which are constantly moving. 1 of 14 Why do the tectonic plates move? Because of convection currents in the mantle that are caused by radioactive decay. 2 of 14 Where do Earthquakes and volcanoes happen? Where tectonic plates meet, but it is difficult to predict accurately when and where earthquakes will happen. 3 of 14 What is Wegener's theory? Theory of continental drift, which was not accepted for many years. 4 of 14 How much do tectonic plates move? A few centimetres a year. 5 of 14 What are convection currents caused by? Energy released by the decay of radioactive elements heating up the mantle. 6 of 14 What happens where the tectonic plates meet? Huge forces build up, eventually the rocks give way, changing shape or moving suddenly causing earthquakes, volcanoes or mountains to form. 7 of 14 Who was the scientist that put forward the idea of continental drift and when? Alfred Wegener in 1915. 8 of 14 Why didn't other scientist accept Alfred Wegener's theory of continental drift at the time? Because he could not explain why the continents moved. 9 of 14 What did other scientist believe? That the Earth was shrinking as it cooled. 10 of 14 When was Wagener's theory accepted? In the 1960's scientists found new evidence and the theory of plate tectonics was developed. 11 of 14 What causes tectonic plates to move? Convection currents caused by heating of the mantle by energy from radioactivity or decay of radioactive elements. 12 of 14 Why can scientist not predict when and where earthquakes will happen? We do not know enough about what is happening inside the Earth/we do not have good enough data or models to make accurate predictions. 13 of 14 Why were Wegener's ideas not accepted for many years? He could not explain why the continents moved and they had their own/different/established ideas about the Earth. 14 of 14
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