The Structure of the Earth 5.0 / 5 based on 1 ratingTeacher recommended ? GeographyNatural hazardsA2/A-levelAQA Created by: 12WrighHCreated on: 14-03-18 13:30 Who first proposed the theory about the Earth's structure? Edmond Halley 1 of 20 What is the crust? The outer layer of the Earth in which we live on 2 of 20 What is the thickness of the crust? Between 5 to 10km under oceans, and up to 70km under continents 3 of 20 What are the two types of crust? Oceanic and continental 4 of 20 What is oceanic crust? An occasional broken layer of basaltic rocks known as sima (silica and magnesium) 5 of 20 What is continental crust? Bodies of mainly granitic rocks known as sial (silica and aluminium) 6 of 20 What is the lithosphere? The zone that tectonics are formed, the crust and upper mantle together 7 of 20 What is the mantle? This it the widest section of the Earth 8 of 20 How thick is the mantle? 2900km 9 of 20 What state are the rocks in? Silicate rocks are in a thick, liquid state, which becomes denser with depth 10 of 20 What is the asthenosphere? Part of the upper mantle, where rocks are rheid 11 of 20 What happens to density as you go down into the lower mantle? It increases 12 of 20 What is the core? The centre and hottest part of the Earth 13 of 20 What temperatures can the core reach? 5000 degrees celcius 14 of 20 What is the core made up of? Mainly iron and nickle 15 of 20 How dense is the core? Four times as dense as the crust 16 of 20 What is the core split up into? The outer core and the inner core 17 of 20 What is a major cause for the Earth's activity? The core's internal heat 18 of 20 What is the greatest source of heat energy within the Earth? Radioactivity- Decay of Uranium, Thorium, Potassium, etc.. 19 of 20 What are the currents called which are partly responsible for plate movement? Convection currents 20 of 20
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