Plate Tectonics & Associated Hazards 0.0 / 5 ? GeographyPlate tectonicsA2/A-levelAQA Created by: lauren.glendenningCreated on: 17-04-16 10:13 Who proposed the theory that the Earth was once one continent? Wegner 1 of 20 How long ago was the Earth's surface all one continent? 300 million years ago 2 of 20 What was the super continent called? Pangea 3 of 20 Later, what did the super continent split into? North continent (Laurasia) and South Continent (Gondwanaland) 4 of 20 What is the inner layer of the Earth called? The crust 5 of 20 What is the crust made up of? Dense rocks containing nickel and iron alloys 6 of 20 What is the core divided into? A solid inner core and a molten outer core 7 of 20 What is the estimated temperature of the core? Over 5,000 degrees Celsius 8 of 20 What is the mantle made from? Molten and semi-molten rocks containing lighter elements e.g. silicon and oxygen 9 of 20 What is the crust made of? Even lighter rock and elements e.g. silicon, oxygen, aluminium, potassium and sodium 10 of 20 What would the thickness of the crust be under the sea? 6-10km thick 11 of 20 What would the thickness of the crust be under the continents? 30-40 km thick 12 of 20 What would the thickness of the crust be under the highest mountain ranges? 70 km thick 13 of 20 What is the upper mantle divided into? The lithosphere and the asthenosphere? 14 of 20 What does the lithosphere consist of? The crust and the rigid upper section of the mantle 15 of 20 How thick is the lithosphere approximately? 80-90 km thick 16 of 20 What is the lithosphere divided into? 7 large plates and a number of smaller ones 17 of 20 What two categories are plates divided into? Oceanic and Continental 18 of 20 What is the difference between an oceanic and continental plate? What they are made from 19 of 20 What is the asthenosphere? Semi-molten rock on which plates float and move due to convection currents 20 of 20
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