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F791 Global Tectonics 1.1.2 Earth Layers Name ………………………………………………………… Marks 2 The lithosphere is broken up into tectonic plates. (a) (i) Name the two main layers that make up the lithosphere. ........................................................................................................................................... [1] (ii) Name a plate that is composed largely of oceanic crust. …………………….………………………………………………………………………………[1] (iii) Where is the lithosphere thickest? ………………………………………………………………………………...……………….....[1] (iv) Where is the lithosphere thinnest? ……………… ………………………………………………………………………………….[1] (b) The data below shows the increase in temperature with depth. Depth / km Temperature / ºC 0 10 50 900 100 1200 150 1400 200 1525 250 1600 300 1675 350 1700 (i) Plot a line graph of the data on the axes below. D:\147014351.doc6/23/2017 [3] F791 Global Tectonics 1.1.2 Earth Layers (ii) What is this increase in temperature with depth called? …………………………………………………………………..……………………………….[1] (iii) Using the graph, state the depth for the top of the asthenosphere …………………………..km the bottom of the asthenosphere ………………………km (iv) [2] Name the rock that is believed to form the asthenosphere. ………………………………………………………………………………………………….[1] (v) State one reason why the asthenosphere has a lower earthquake wave velocity than the rest of the mantle. ……………………………………………………………………………………………………… …………………..............................................................................................................[1] (c) (i) Complete the data grid below for the outer core and inner core of the Earth. Inner core Depth below surface Outer core km km composition Physical state [3] (ii) Explain how density and meteorite data helps us to infer the nature of the inner and outer core. ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ……………………………………………………………………………………………………….[3] [Total: 18] D:\147014351.doc6/23/2017