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At a destructive plate boundary There are three kinds of plate tectonic boundaries: constructive or divergent boundaries destructive or convergent boundaries conservative or transform plate boundaries. Student task 1A Study the diagram below. Use the diagram to describe the differences between the continental and oceanic crusts. Write your answer in the space below. © Booyabazooka 2006, commons.wikimedia.org/wiki/File:Active_Margin.svg ............................................................................................................ ............................................................................................................ ............................................................................................................ ............................................................................................................ ............................................................................................................ ............................................................................................................ ............................................................................................................ ............................................................................................................ ............................................................................................................ ............................................................................................................ ............................................................................................................ ............................................................................................................ © www.teachitgeography.co.uk 2016 25807 Page 1 of 3 At a destructive plate boundary Student task 1B Study the diagram of a destructive plate boundary below. Use the word bank and the diagram to help you: 1. describe the process occurring at a destructive plate boundary and 2. the differences between the continental and oceanic crusts. convection mantle older younger thicker thinner less dense more dense subduction melting magma volcano Write your answer in the space below. 1. The process occurring at a destructive plate boundary is: .................................................................................................... .................................................................................................... .................................................................................................... .................................................................................................... 2. The differences between the continental and oceanic crusts are: .................................................................................................... .................................................................................................... .................................................................................................... .................................................................................................... © www.teachitgeography.co.uk 2016 25807 Page 2 of 3 At a destructive plate boundary Teaching notes Two versions of the resource are included. Student task 1A focuses on the differences between continental and oceanic crusts, i.e. not on the processes at a destructive plate boundary. Student task 1B is a differentiated version to aid less able students with an accompanying word bank. The differentiated version also requires less depth of knowledge for the answer as the question is split into two sections. Sample answers Student task 1A: Continental crust at over 1,500 million years old is much older than the oceanic crust at less than 200 million years old. Continental crust is less dense than oceanic crust and cannot subduct (sink) beneath other tectonic plates. Continental crust, which is mainly granite, cannot be renewed or destroyed unlike oceanic crust, which is usually basalt. Continental crust is thicker than oceanic crust and forms continents. Oceanic crust is heavier than continental crust. It forms on the floor of the ocean. Student task 1B.1: Convection currents are causing the oceanic plate to crash into the continental plate. The oceanic plate is being subducted (sinking) under the continental plate. This causes melting. Magma rises towards the surface. The magma make break through the crust and form a volcano / volcanic eruption. Student task 1B.2: Continental crust is thicker than oceanic crust. Continental crust is much older than the oceanic crust. Continental crust is less dense than oceanic crust and cannot be subducted (sink). Oceanic crust is heavier than continental crust and forms on the floor of the ocean. Continental crust cannot be renewed or destroyed, unlike oceanic crust. © www.teachitgeography.co.uk 2016 25807 Page 3 of 3