Geography_May_06_GeographySLPaper2MarkschemeMay06

Geography_May_06_GeographySLPaper2MarkschemeMay06 - c IB...

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c IB DIPLOMA PROGRAMME PROGRAMME DU DIPLÔME DU BI PROGRAMA DEL DIPLOMA DEL BI M06/3/GEOGR/BP2/ENG/TZ0/XX/M+ MARKSCHEME May 2006 GEOGRAPHY Higher Level and Standard Level Paper 2 26 pages
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- 2 - M06/3/GEOGR/BP2/ENG/TZ0/XX/M+ This markscheme is confidential and for the exclusive use of examiners in this examination session. It is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of IBCA.
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- 3 - M06/3/GEOGR/BP2/ENG/TZ0/XX/M+ SECTION A A1. Drainage basins and their management Either (a) Essay To what extent do you agree that river landforms can be classified as either erosional or depositional? [20 marks] This question invites candidates to review a number of river landforms and evaluate the contribution of erosional and depositional processes to their formation. It is expected that responses will identify some landforms that are entirely the result of erosional processes (gorges, incised meanders, waterfalls) and some that are entirely depositional (alluvial fans, levees). Good responses should also recognize that a number of landforms are the result of both processes such as flood plains, terraces and meanders. Responses are not expected to give detailed accounts of the formation of each landform, but the contribution of erosion and deposition should be made clear. Every river landform need not be referred to, but enough should be included to formulate a relevant argument. Responses that simply catalogue or list river landforms as either erosional or depositional, without any discussion, that is weighing up the relative contributions of erosion and deposition, should not be able to move above band F. Responses that agree that landforms can be classified as either erosional or depositional should be credited, as long as valid evidence is used and the case is well argued. The marks should be allocated according to the markbands.
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- 4 - M06/3/GEOGR/BP2/ENG/TZ0/XX/M+ Or (b) Structured question (i) Define the term flash flood . [1 mark] A flash flood is a sudden rise in the discharge of a river. Responses that define it as a higher discharge with a short lag time are also acceptable. (ii) Identify factors A and B and briefly explain how they contribute to flash flooding. [4 marks] Factor A is antecedent rainfall (accept previous rainfall) [1 mark] . Saturated ground will cause more immediate runoff [1 mark] . An alternative possibility for factor A is type of precipitation. Sudden snow melt may result in flash floods. Factor B could be steepness of slopes or permeability of the surface [1 mark] . A brief explanation of how each of these causes rapid runoff is required. The surface permeability may relate to the soil or bedrock [1 mark] . (iii) Explain how human activity can increase the risk of flash
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This note was uploaded on 06/22/2010 for the course COMCC 05123 taught by Professor Mcgee during the Spring '10 term at York County CC.

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Geography_May_06_GeographySLPaper2MarkschemeMay06 - c IB...

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