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Had a go Nearly there Hazardous Earth Nailed it! Tectonics 1 Study Figure 1. depth 0 100 km rock ge rock 650 km rock iron solid pa 2900 km iron liquid 5100 km le 6378 km Figure 1 A cross-section showing the structure of the Earth A Crust B Upper mantle C Lower mantle 2 Compare the physical properties of the core and the mantle. The inner core is solid, whereas aft The inner core is hotter – over 3 Explain how convection currents cause plate movement. Dr Guided (1 mark) sa D Core mp Which of the following is the thickest layer in the cross-section of the Earth? (2 marks) Circular motion is important to the movement. (3 marks) 9