Structure of the Earth 0.0 / 5 ? GeographyTectonicsIGCSEAQA Created by: Lotto65Created on: 12-12-15 16:00 What is the centre of the Earth called? The core 1 of 18 What is the centre of the Earth made of? Solid iron and nickel 2 of 18 What is around the core in the Earth? The mantle 3 of 18 What is the mantle made of? Semi-molten rock 4 of 18 How fast does the mantle move? Very slowly 5 of 18 What is the outer layer of the Earth called? The crust 6 of 18 Give two types of crust Oceanic crust and Continental crust 7 of 18 How thick is the crust? Quite thin- 20km 8 of 18 What is crust divided into? Tectonic plates 9 of 18 Are tectonic plates all the same size? No- they vary in size 10 of 18 How is crust positioned on the mantle? It floats on top 11 of 18 What is a plate margin? The join where two plates meet 12 of 18 What causes the plates to move? Convection currents within the mantle 13 of 18 What is a convection current? The circular currents of heat in the mantle 14 of 18 How dense is the mantle? Quite dense 15 of 18 Give some characteristics of oceanic crust? New- 200 million years old; Dense; Can sink; Can be created and destroyed; Thinner that continental crust 16 of 18 Give some characteristics of continental crust? Old- 1500 million years; Less dense; Cannot sink; Cannot be created or destroyed; Thicker than oceanic crust 17 of 18 Give the four layers in the Earth Inner core, outer core, mantle, crust 18 of 18
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